737 Mid-Cabin Emergency Exit Doors - Plug Option @ChrisBrady737

The Boeing 737 Technical Channel Please note this video has been superseded by youtu.be/5FcyvFfHsjQ

This video is a follow up to yesterday’s video on 737 Mid-cabin Emergency Exit Doors. In it I focus on the construction and securing of the plug option.
This is in response to the incident to Alaska Airlines flight AS 1282 whose mid-cabin emergency exit door plug detached in-flight whilst climbing through 16,000ft on 5 Jan 2024. Fortunately, there were no injuries.
*** Errata ***
In this video I state that a downwards force is required to remove the door plug. I based this statement on text in the AMM SDS which I now believe to be incorrect or misleading. It is possible that a very small downwards motion (1-2mm) is first required to be able to free the locking bolts. But the door must be moved upwards by a couple of inches to clear the guide tracks. Apologies for any confusion.
An updated explanation can be found here youtu.be/kKSNdqtG3dY

Contents:
0:58 Introduction
1:24 The Plug Option
3:57 Construction
7:26 Securing The Door
11:39 Alaska Airlines 1282
14:38 Fallout

updated 2 years ago

737 Mid-Cabin Emergency Exit Doors - Plug Option

The Boeing 737 Technical Channel 2024-01-07 | Please note this video has been superseded by youtu.be/5FcyvFfHsjQ

This video is a follow up to yesterday’s video on 737 Mid-cabin Emergency Exit Doors. In it I focus on the construction and securing of the plug option.
This is in response to the incident to Alaska Airlines flight AS 1282 whose mid-cabin emergency exit door plug detached in-flight whilst climbing through 16,000ft on 5 Jan 2024. Fortunately, there were no injuries.
*** Errata ***
In this video I state that a downwards force is required to remove the door plug. I based this statement on text in the AMM SDS which I now believe to be incorrect or misleading. It is possible that a very small downwards motion (1-2mm) is first required to be able to free the locking bolts. But the door must be moved upwards by a couple of inches to clear the guide tracks. Apologies for any confusion.
An updated explanation can be found here youtu.be/kKSNdqtG3dY

Contents:
0:58 Introduction
1:24 The Plug Option
3:57 Construction
7:26 Securing The Door
11:39 Alaska Airlines 1282
14:38 Fallout

737 CVR FDR Power

The Boeing 737 Technical Channel 2025-01-13 | This short video is issued in the wake of the Jeju 737-800 accident at Muan, South Korea in December 2024 in which it was discovered that the FDR and CVR stopped working in flight. The video covers the power sources of the recorders, circuit breakers and their locations on the aircraft.

Many viewers have asked why the FDR has a DC circuit breaker. The DC comes from the 28V DC Bus 1 and powers the following components:
• FDAU status relay
• Flight recorder test module
• FDR fault logic.
It is important to stress that the FDR is powered by 115V AC from transfer bus 1. If transfer bus 1 is unpowered, the FDR will not record regardless of any power on DC bus 1.

737 Channel - The Book

The Boeing 737 Technical Channel 2025-01-09 | If you have enjoyed watching my 737 systems videos, you may be interested in the accompanying book. This contains all of the screens from all of the systems videos on this channel.
The book is over 3,000 pages long and is available both for iPad and Kindle. Search for "Chris Brady 737" on Amazon to find it.

737 GPS Interference

The Boeing 737 Technical Channel 2024-06-28 | This covers the topical subject of GPS Interference, such as jamming and spoofing which is prevalent in areas of conflict or tension such as Ukraine, Syria, Israel and the NATO border with Russia. Although GPS interference is aimed at downgrading military capability it also affects commercial air transport. In this video I describe how the 737 navigates, how GPS works, what effects can be seen during interference and what measures can be taken to mitigate these effects..
Contents:
2:02 FMC Position
10:55 Radio Position
17:56 IRS Position
31:58 GPS Background & Theory
49:29 GPS Equipment
1:00:03 GPS Interference
1:26:52 Hybrid GPS-Inertial

737 Oxygen

The Boeing 737 Technical Channel 2024-03-06 | This video covers the description, use, checking and servicing of flightdeck, cabin and portable oxygen systems and some interesting options available.
Contents:
0:32 Flightdeck Oxygen
1:17 Mask
19:28 Pressure
27:00 Servicing
39:29 Cabin Oxygen
1:02:33 Additional Oxygen Options
1:07:18 Freighter Oxygen
1:10:48 Portable Oxygen Systems
1:14:18 737-100/200 Differences

AS1282 NTSB Preliminary Report

The Boeing 737 Technical Channel 2024-02-07 | This video is my analysis of the NTSBs preliminary report into the Alaska Airlines AS1282 mid-cabin door plug event of 5 Jan 2024.
I simply cover what happened and why/how it happened as far as it is known.

Contents:
2:21 What happened
22:55 How It happened
28:55 Other Technical Aspects

Link to the NTSB Preliminary Report:
ntsb.gov/investigations/Documents/DCA24MA063 Preliminary report.pdf

737 Technical Aspects of AS1282 Updated

The Boeing 737 Technical Channel 2024-01-17 | This video is an update on the technical aspects of Alaska Airlines AS1282 mid-cabin door plug event of 5 Jan 2024.

I have updated many of the diagrams & descriptions and added animations to show the closing and locking mechanism. I have also improved the sound quality.

Contents:
0:40 Hinges
1:50 Guide Tracks and Pins
2:56 Securing the Door Plug
4:05 Stop Fittings
6:28 Post-Incident Developments
11:49 Other Technical Aspects
11:52 Door Warnings
12:44 Pressurisation System
17:02 Flightdeck Door Opening

737 Technical Aspects of AS1282 FAQs

The Boeing 737 Technical Channel 2024-01-11 | Please note this video has been superseded by youtu.be/5FcyvFfHsjQ

Since my previous video on the mid-cabin exit door plug option, a lot of additional questions have been raised about the door and some associated systems. I will try to address those questions here with some new and hopefully helpful photographs.

There was also an error in that video in which I said the door plug had to be pushed down to open. It actually has to be lifted up. The error is also in the AMM.

Contents:
0:50 Introduction
1:32 Is It a Plug-Type Door?
2:28 How is it Held in Place?
8:55 What are the Springs For?
9:36 Identifying the Plug Option
11:19 Flightdeck Door Warnings
11:58 Pressurisation System
15:48 Flightdeck Door Opening

737 Mid-Cabin Emergency Exit Doors

The Boeing 737 Technical Channel 2024-01-06 | This video is in response to the incident to Alaskan Airlines flight AS 1282 whose mid-cabin emergency exit door detached in-flight whilst climbing through 16,000ft on 5 Jan 2024. Fortunately, there were no injuries.

In it I cover the reason for the mid-cabin exit door, its construction and operation, Door Warnings & Flightlocks, the SPSEU, MAX PSEU Differences and Alaskan 1282.

*** Errata A deactivated mid-cabin exit door limits the maximum pax capacity to 189, not 175 as I stated in this video. ***

Note that there is now a follow-up video with more material here youtu.be/maLBGFYl9_o

Contents:
0:42 Introduction
1:27 Operation
4:59 Options
14:31 Door Warnings & Flightlocks
17:22 SPSEU
19:36 MAX PSEU Differences
21:44 Alaskan 1282

737 Windows

The Boeing 737 Technical Channel 2023-12-31 | This video gives a technical description of the windows and associated systems and procedures in the Boeing 737.
Contents:
1:17 Flight Deck Windows
1:41 Eyebrow Windows
4:22 Construction
16:00 Hydrophobic Coating
19:45 Window Heat
49:48 Fringe Patterns
55:24 Window #2
1:06:24 Sun Visors
1:07:18 Window Problems
1:30:30 Frame Cracks
1:32:10 QRH Procedures
1:38:20 Passenger Windows
1:45:25 Miscellaneous Windows

737 Lights

The Boeing 737 Technical Channel 2023-09-30 | This video covers the many lighting systems on the Boeing 737.
Contents:
1:01 External Lights – Operated from the flightdeck
34:15 Service Compartment Lighting
38:14 Flightdeck Lighting
49:14 Electrical Power, Light Testing, Replacing Bulbs & the MEL
1:02:22 Cabin Lighting
1:07:27 Emergency Lighting
1:20:54 Circuit Breakers

737 Rudder Story

The Boeing 737 Technical Channel 2023-07-21 | In this video I explain the rudder issues that beset the 737 in the 1990s. I take you through the accidents, investigations, contrasting opinions, design changes and the many QRH changes that the 737 rudder system has gone through, that all started with two mysterious accidents in the early 1990s for which no conclusive evidence was ever found. I also explain how those events led to a complete reformat of the QRH, the introduction of upset recovery training, and FDR improvements.

Contents
0:46 UA585, Colorado Springs
6:29 The Original Rudder System
26:20 The Second Accident US427, Pittsburgh
27:42 Critical Design Review
30:42 Boeing Yaw Damper Article
33:27 Eastwind 517
34:31 NTSB Intervention
36:43 QRH Change
38:58 Blowdown & Crossover Speed
56:20 Reaction to the NTSB Recommendations
1:02:00 More ADs
1:03:32 First Design Changes
1:11:37 Two More Incidents
1:13:51 US427 Report
1:22:59 Block Speeds Increased
1:26:22 Engineering Test and Evaluation Board
1:35:35 Rudder System Enhancement Program
1:50:11 Evolution of QRH Procedures
1:58:12 FDR Development
2:09:30 Flight Ops Tech Bulletin
2:11:33 Final Thoughts

737 P8 Poseidon

The Boeing 737 Technical Channel 2023-05-09 | This is a detailed description of the P-8A Poseidon. It covers both external and internal features, flightdeck differences from the 737NG and all known derivatives & increments.

Contents:
1:28 History & Development
11:56 External features
36:32 Main Instrument Panels
44:12 Aft Electronic Panel
58:20 Aft Overhead Panel
1:03:11 Main Overhead Panel
1:19:31 Vulnerability Reduction features
1:23:39 Cabin Features

I have used screenshots or video extracts from the following sources:
Airshow World
facebook.com/RAFLossiemouth/videos/163882182100889
youtu.be/BK_CLy3qi5E
youtu.be/HydbNDmzFxs
youtu.be/QXRjw4kfj5E
youtu.be/S4yI1luXwmg
youtu.be/ANIzwotNsPk
youtu.be/QXRjw4kfj5E
youtu.be/MuPKTmFbc5o
youtu.be/mGb6uRIGpWs
youtu.be/r4GxNXT80P0
youtu.be/v9SyLzJQxHI
Photographs that are not mine are credited individually on-screen.

737 Alternate Forward Center of Gravity Option

The Boeing 737 Technical Channel 2023-04-15 | This video describes the theory and practical application of the Alternate Forward Center of Gravity option for the 737 NG and MAX.

Contents:
1:08 Introduction
2:27 Theory
12:00 Series Differences
18:15 In Practice
20:27 Choosing Limit Positions
30:01 OPT Configuration
32:40 OPT Examples
42:25 FMC Speeds

737 Freighters

The Boeing 737 Technical Channel 2023-02-28 | This video describes the history and development of Boeing 737 freighters from the 737-200C through to the 737-800BCF. It also covers all third-party conversions by AEI, Pemco and IAI, describing the specific technical and operational differences between cargo 737s and passenger versions.

Contents:
1:53 Versions
21:11 Economics
32:47 Converters
43:19 Differences from Pax Aircraft
1:09:06 Main Cargo Doors
1:33:04 Flightdeck Differences
1:44:03 Fire & Smoke Protection
1:59:23 Horse Freighters
2:02:57 Loading and Weight & Balance
2:16:37 Operation & Documentation

This is an update to my original 737 Freighters video. It includes two recent weight / ballast shift events. It also corrects an error in the Expedited Descent manoeuvre, descent from FL250 commences at 50nm, not 25nm as I stated in the first video.

737 BBJ

The Boeing 737 Technical Channel 2023-01-14 | This video describes the history and development of the Boeing Business Jet (BBJ), its unique features and differences from regular airline 737s.

Contents:
0:52 History
4:48 Versions
14:05 Differences from NG / MAX
15:45 Completion
24:17 Winglets
34:22 Performance
41:51 Cabin Interior
50:35 Comms / IFE
1:03:11 Fuel
1:14:20 Air Systems
1:19:44 HUD/EVS
1:24:33 FMC Options

737 PSEU

The Boeing 737 Technical Channel 2022-12-17 | A detailed description of the Proximity Switch Electronic Unit and air-ground systems on the 737. (Updated)

Contents:
2:51 Background
6:23 PSEU
11:35 SPSEU
16:04 MAX Differences
21:48 Proximity Sensors
27:35 Air-ground
37:32 Airstairs control & warning
38:10 Door warnings & flightlocks
39:57 LGTU
41:21 Take-off & landing configuration warnings
42:18 Landing gear position indicating and warning
43:44 Speedbrake deployed indication and warning
44:49 Two-position tailskid
46:03 Crew procedures
48:43 Problems and updates

737 FMC U11 to U14.1

The Boeing 737 Technical Channel 2022-11-14 | This video is the last of my 4-part series illustrating the development of the Boeing 737 FMC. This part covers update 11 to update 14.1. As always, this should be of interest to anybody using the current FMC update as it explains the various features and options as they were introduced and developed. I am confident that every 737 pilot will learn something new from this video.

Contents:
0:00 Intro
0:56 Update 11
24:10 Update 12
31:48 Update 13
52:12 Update 14
1:06:34 Update 14.1

737 FMC U10.6 to U10.8A

The Boeing 737 Technical Channel 2022-10-15 | This video is the 3rd of my 4-part series illustrating the development of the Boeing 737 FMC. This part covers update 10.6 to update 10.8A. As always, this should be of interest to anybody using the current FMC update as it explains the various features and options as they were introduced and developed. I am confident that every 737 pilot will learn something new from this video.

Contents:
0:00 Intro
1:13 Update 10.6
17:24 Update 10.7
51:24 Update 10.8
1:01:04 Update 10.8A

737 FMC U10.3 to U10.5A

The Boeing 737 Technical Channel 2022-09-13 | This video is the 2nd of my 4-part series illustrating the development of the Boeing 737 FMC. This part covers update 10.3 to update 10.5A. As always, this should be of interest to anybody using the current FMC update as it explains the various features and options as they were introduced and developed. I am confident that every 737 pilot will learn something new from this video.

Contents:
0:00 Intro
1:01 Update 10.3
23:59 Update 10.4
35:36 Update 10.4A
36:20 Update 10.5
1:01:08 Update 10.5A

737 FMC U10.0 - U10.2A

The Boeing 737 Technical Channel 2022-08-19 | The video describes the features of the Boeing 737 FMC from update 10.0 to update 10.2A.

Contents:
0:00 Intro
3:38 Update 10.0
42:59 Update 10.1
53:35 Update 10.2
1:00:45 Update 10.2A

737 Head Up Display

The Boeing 737 Technical Channel 2022-07-01 | This video is about the 737 Head Up Display. In it I discuss all models of HUDs used on the 737, their components, modes and symbology. I also cover EVS, SVS & EFVS and finish with a discussion on the value of a HUD in an airliner. I think this video has something of interest for everyone, even if you do not have HUD installed on your aircraft at present.

Contents:
0:45 History
8:50 Terminology
11:33 Components
29:24 Annunciator Panels
36:01 Symbology
55:05 Modes
1:06:52 BITE
1:09:18 Compatibility
1:20:54 EVS
1:43:12 SVS / EFVS
1:50:37 Minima
1:54:57 Summary

737 FMC

The Boeing 737 Technical Channel 2022-04-19 | This video is about the technical aspects of the 737 FMC.

Contents:
1:18 Evolution of the FMC
7:03 Overview
12:53 FMC Hardware
26:01 Dual FMCs
40:05 CDU / MCDU
56:35 Alerts & Annunciators
1:02:30 CDU BITE
1:04:17 Inputs
1:09:20 Databases
1:21:17 Data Loading
1:30:13 Maintenance pages

737 CVR, FDR, ELT, LF-ULB, DFDAU and QAR

The Boeing 737 Technical Channel 2022-03-04 | This video covers the CVR, FDR, ELT, LF-ULB, DFDAU and QAR on the 737. It also discusses the use of ACMS data within an airline and how hard landings are measured.

Contents:
1:06 CVR & FDR General
10:21 ELT
20:45 LF-ULD
25:47 CVR
36:17 Circuit Breakers
42:44 FDR
48:38 DFDAU
55:03 Data Downloading
59:54 ACMS
1:08:30 Landing G

737 Tailskid

The Boeing 737 Technical Channel 2022-02-18 | This is a detailed look at the tailskid options on the 737 and the issue of tail strikes.
Contents
0:38 One-position Tailskid
8:04 Two-position Tailskid
18:01 Effect of Impact
31:04 Geometry
43:10 Tailstrikes

737 Short Field Performance

The Boeing 737 Technical Channel 2022-02-09 | This is a detailed look at the Short Field Performance improvement package that has been offered on the NG and MAX since 2006.
Contents
0:43 Overview
5:42 Spoiler deflection
8:01 High lift devices
18:13 Two position tailskid
27:05 Idle thrust delay
29:45 Landing gear
33:35 Software updates
42:03 Options

737 Winglets

The Boeing 737 Technical Channel 2022-01-23 | The history, technical and operational details of winglets on the Boeing 737.

Contents
0:42 History
13:59 Induced Drag
18:22 Design Considerations
30:38 Benefits
40:04 Operational Differences
48:16 Physical Differences
56:05 Retrofitting
1:00:38 Winglets for Classics
1:03:06 Split Scimitar Winglets
1:08:35 Advanced Technology Winglets
1:14:50 Raked Winglets
1:16:11 Mini Winglets
1:17:59 Damage

737 Wings

The Boeing 737 Technical Channel 2022-01-12 | The history and details of the 737 wing from prototype to MAX. Please note that winglets are covered in the next video.

Contents
0:44 Design History
17:55 Evolution
27:57 Construction
37:34 Vortex Generators
43:35 Static Dischargers
48:21 Wingtips
53:55 Flap and Aileron Droop

Errata - at 32:01 the wing-body faring on the NG & MAX also contains the standby hydraulic pump and the brake accumulator. The photo used in this video was of a Classic.

737 Performance Improvement Package

The Boeing 737 Technical Channel 2022-01-02 | This presentation details the changes made to the Boeing 737 NG with the introduction of the Performance Improvement Package in 2011/2.

Contents:
0:42 Overview
5:06 Anti-collision lights
6:30 ECS inlet and exhaust
12:38 Wheel-well fairings
14:52 Slats & Spoilers
21:10 CFM56-7BE “Evolution”
31:06 7BE Benefits & Intermixing
35:58 7BE Relight Envelope

737 Flaps and Slats

The Boeing 737 Technical Channel 2021-12-19 | This video covers the evolution, operation and mechanics of the flaps, slats and the FSEU.

Contents:
0:33 LE Flaps
11:17 LE Slats
32:38 TE Flaps
50:07 TE Flap Mechanics
1:05:48 Flap & Slat Power
1:13:02 FSEU
1:28:15 Flap Limit Speeds and Load Relief
1:37:08 Flap Speed Schedule

737 Electrical Equipment Bay

The Boeing 737 Technical Channel 2021-12-07 | A detailed explanation of the components and layout of the 737 E & E Bay, Forward Equip Bay and other equipment racks on the aircraft. In addition to my standard presentation format I have included 3 "Video tours" of the E & E Bay, Forward Equip Bay and an example BITE check.

Contents:
0:44 E & E Bay General
8:23 Junction Boxes
12:03 Moisture Protection
17:34 Equipment Cooling
21:45 Batteries
23:36 Racks
38:00 E & E Bay Video Tour
40:29 E6 Rack
42:59 Auxiliary Fuel Equipment Rack
43:53 Forward Equipment Bay
51:40 BITE Testing

737 Max Differences

The Boeing 737 Technical Channel 2021-11-16 | A detailed look at the differences between the 737 MAX and the 737 NG.
Contents
0:00 Intro
0:58 The MAX Family
3:52 Powerplant
14:18 Landing Gear
22:50 Fuselage
26:27 APU
22:43 Fire Protection
37:19 Air Systems
46:55 Miscellaneous
58:52 Wings
1:02:50 FBW Spoilers
1:11:12 Onboard Maintenance System (OMS)
1:21:18 MAX Display System (MDS)

737 Doors

The Boeing 737 Technical Channel 2021-10-25 | The Boeing 737 doors explained.
This covers all aspects of the 737 doors and is full of info not contained in the FCOMs. As ever please show your support by liking, sharing and leave a comment. This is really important feedback as it lets me know if I am pitching these at the right level for everybody.

Contents:
0:00 Intro
0:43 Construction
4:55 Gates
07:16 Latching
12:24 Stops
14:53 Hinges
16:06 Seals
25:29 Insulation & heating
27:36 Mechanisms
33:13 Cautions
35:54 Drains
38:40 Mid Cabin Emergency Exit Doors
42:40 Overwing Exits
51:14 Cargo Doors
56:31 Door Warnings

737 Nitrogen Generation System

The Boeing 737 Technical Channel 2021-09-19 | Since 1959 there have been 18 fuel tank explosions on transport category aircraft. The many causes include lightning, wiring defects and heating of fuel vapours in the center tank. Following the TWA800 accident, the FAA produced Special FAR 88 in 2001 and the Fuel Tank Flammability Reduction (FTFR) Rule in 2008 both of which mandated extensive safety improvements to fuel systems.

As 737 pilots we have seen the effects of this in changes to center tank pump design and operation, and the introduction of NGS.

In this video I will cover the background to these changes in more detail, the ensuing regulation and NGS in depth.

Contents
0:00 Intro & Overview
2:10 The accidents
8:29 Flammability reduction
11:29 Removal of ignition sources
17:04 Center tank pump changes
20:47 Fuel tank inerting
36:42 NGS on the 737
1:02:49 Summary & timeline

Trailer

The Boeing 737 Technical Channel 2021-09-02 | An introduction to the Boeing 737 Technical Channel by Chris Brady.

737 Fuel

The Boeing 737 Technical Channel 2021-08-31 | The Boeing 737 Fuel System
This covers every variation of the system I have flown or am aware of and is full of info not contained in the FCOMs. As ever please show your support by liking, sharing and leave a comment. This is really important feedback as it lets me know if I am pitching these at the right level for everybody.

Contents:
0:00 Intro & Overview
1:22 Internal Fuel Panels
12:48 Refuelling & Defueling
19:22 Fuel Tanks
31:21 Fuel Pumps
39:53 Center Tank Fuel
44:57 APU Fuel
48:26 Fuel Temperature
51:32 Fuel Quantity Measurement
1:03:53 Fuel Quantity Indication
1:14:13 Auxiliary Fuel
1:30:06 Fuel Heat Exchangers

737 Side Cargo Door Open

The Boeing 737 Technical Channel 2021-08-23 | Video of and details about operations with the side cargo door open.

737 Antiskid Inoperative

The Boeing 737 Technical Channel 2021-08-18 | Following the recent video of a tyre fire following a landing with anti-skid inop, this video looks at the various technical and operational considerations about this system.

737 Flight Controls - Pitch

The Boeing 737 Technical Channel 2021-08-12 | This video is the last of the 3-part series on Boeing 737 Flight Controls. This one covers pitch.

Contents:
0:00 Introduction
1:25 Stabiliser
2:52 Stabiliser control
8:51 Stabiliser trim
22:35 Elevators
27:09 Elevator tabs
34:21 Elevator control
46:11 Elevator feel
55:22 Neutral shift

My thanks to Captain Abdulmuati Asiri for the use of his video clip of Neutral Shift
youtu.be/9CXn2STJtvI

737 Flight Controls - Yaw

The Boeing 737 Technical Channel 2021-07-29 | This video is the second of the 3-part series on Boeing 737 Flight Controls. This one covers yaw.

Contents:
0:00 Intro
0:31 Rudder
6:13 Rudder Control
16:29 Rudder Trim
35:02 RSEP
49:09 Rudder Power
52:34 Yaw Damper
1:07:55 Vertical Stabiliser

737 Flight Controls - Roll & Speedbrakes

The Boeing 737 Technical Channel 2021-07-07 | This video is the first in of a 3-part series on Boeing 737 Flight Controls. This one covers roll control and also speedbrakes.

Contents:
0:00 Intro
0:43 Ailerons
3:07 Flight Spoilers & Speedbrakes
14:38 Ground Spoilers
18:03 Aileron - Spoiler Mechanics
56:43 Jams etc
58:37 Aileron – Spoiler Interaction
1:10:15 MAX Fly-By-Wire Spoilers

737 Hydraulics

The Boeing 737 Technical Channel 2021-06-29 | This is part two of 737 hydraulics. In this video I go deep into the systems, showing you, and explaining the function of, the parts of the systems that the FCOMs leave out to give you a full understanding of the subject.
Contents:
0:00 Intro
4:11 Reservoirs pressurisation & fluid
26:38 Pumps
43:54 Pressure Modules, fuses and filters
53:32 Indications
59:12 Services
1:03:35 Redundancy
I recommend that you watch the companion video "737 Hydraulics - Wheel Well Tour" first.

737 Hydraulics - Wheel Well Tour

The Boeing 737 Technical Channel 2021-06-22 | A guided tour of the hydraulic systems and components in the wheel well of a Boeing 737-400.
0:00 Intro
0:33 System B components
7:02 Refill point
7:52 Standby system components
9:29 The PTU
10:13 System A components
12:37 NG/Max differences

737 Landing Gear Guided Tour (Classics)

The Boeing 737 Technical Channel 2021-06-16 | This video is different to my previous ones because I actually show you the landing gear system in situ.
I take you around the main and nose landing gear showing you the significant components and explaining their function as I go.
For this video I use a 737 Classic, there are some minor differences between the Classics and NGs which are explained in the accompanying presentation on Landing Gear. Hopefully I will be able to film a version on the NG soon.

737 Fire Protection

The Boeing 737 Technical Channel 2021-06-10 | This video covers the Fire Protection systems on all generations of 737.
Maybe not the sexiest of subjects but hopefully I have made it interesting. I think everybody will learn a few things from this that they didn’t already know about the 737. As always if you enjoyed it, give it a YT like, leave a comment and subscribe if you have not already done so.
Subjects covered:
0:00 Intro
0:31 Engine
12:34 APU
16:33 Wheel-well
19:40 Wing-Body Overheat
22:39 Cargo Compartment
32:55 Lavatory
36:50 Electrical Power summary

737 Ice and rain protection

The Boeing 737 Technical Channel 2021-05-26 | A detailed description and history of the Ice and Rain Protections on all generations of the Boeing 737.
0:00 Intro
0:40 Panels
8:56 Window heat
14:27 TAI
26:24 Ice detection
29:44 Icing
35:18 Non-environmental icing
42:30 Wipers
44:03 Rain Repellent

737 Autothrottle Flap Synchro

The Boeing 737 Technical Channel 2021-05-19 | This is a detailed look at the 737 Classic autothrottle computer issues discovered during the investigation of Sriwijaya Air SJ182 at Jakarta on 9 Jan 2021. It covers the A/T design, Boeings MOM and the FAA AD’s.

737 Landing Gear

The Boeing 737 Technical Channel 2021-05-18 | A detailed description and history of the landing gear on all generations of the Boeing 737.
0:00 Intro
1:01 - Main landing gear components
4:11 - Shimmy
10:02 - Doors
11:42 - Gear seals
23:37 - Downlock viewers
26:51 - Manual Extension
32:36 - Nose landing gear components
33:38 - Steering
44:19 - Wheels
47:00 - Tires
55:00 - Brakes
1:01:31 - Accumulator
1:07:16 - Anti-skid
1:09:46 - Autobrakes
1:13:21 - Panels

737 Powerplant

The Boeing 737 Technical Channel 2021-05-11 | A detailed description and history of the engines on all generations of the Boeing 737.
This is a long video. To help you navigate to any parts here is a contents list with timings:
0:00 Intro
0:48 - Engine types
8:43 - Components
11:33 - Upgrades & hushkits
25:45 - Oil, Fuel, PMC/EEC
36:06 - Ignition & Starting
47:32 - Displays
57:15 - Vibration
1:02:59 - Reverse thrust
1:12:38 - Overhead Engine Panel
1:16:13 - Engine Ratings
1:21:03 - BITE Tests
1:25:35 - Limitations

737 Electrics Part 2 - DC Power

The Boeing 737 Technical Channel 2021-05-04 | A detailed look at the Boeing 737 Electrical System. This is Part 2, focusing on the DC System
Contents:
0:00 Intro
0:54 DC System
2:48 TRU’s
14:56 Batteries
22:55 Standby System
30:13 Faults and diagnostics
34:54 Circuit breakers

Please check Part 1 for AC