Uploaded February 2025 | Updated September 2026, 1 week ago
The air intake system provides ambient air of sufficient quantity and quality to the APU. Its major components are:
- a diverter,
- an air inlet (including actuator-driven flap),
- an air duct.
The main function of the air intake system is:
- provide sufficient mass flow to the APU plenum chamber,
- minimization of pressure loss and flow distortion (thus also reducing the danger of APU surge),
- noise reduction,
- reduce the potential for foreign object ingestion,
- prevent exhaust (from APU and main engines) from re-entering the inlet,
- prevent the ingestion of fluids existing externally,
- prevent the accumulation of flammable fluids in the intake system.
Air Inlet
The air inlet assembly is installed as a unit in a cutout in the bottom of the tailcone just forward of the APU compartment, positioned by 4 bolts. The interface to the air duct is attached to the APU compartment forward firewall. The inlet airstream area up to approximately 150mm (6in) forward of the interface to the APU compartment is covered with a CRES face sheet to serve as an extension of the APU compartment fireproof area. A fireproof gasket is used to join the air inlet assembly to the APU compartment firewall.
Air Inlet actuator
This electrically operated linear actuator operates the air inlet flap. Its major components are:
- 28V DC motor with brake control (basic version),
- a limit switch at each end position,
- a flap position switch at each end position,
- thermal overload protection device.
Reason for replacement: troubleshooting
My Flashlights Fenix LD45R:
fenixlighting.com/products/fenix-ld45r-adjustable-beam-flashlight
My Headlight Fenix HL45R:
fenixlighting.com/products/fenix-hl45r-rechargeable-headlamp
where you can find me:
Instagram:
instagram.com/zeto.r
tiktok:
tiktok.com/@zeto.r
Patreon:
patreon.com/Zetomaintenance?utm_campaign=creatorshare_creator
Linkedin
linkedin.com/in/tom%C3%A1%C5%A1-zeman-1861a094
———-Video content———————
00:00 - Intro
00:17 - where we can find air inteke actuator and what is around
01:42 - Removal of the cat walk
02:08 - Retraction of the Actuator
02:40 - Removal of the actuator
07:01 - how the flap looks
07:48 - Installation of the Actuator
08:30 - why we need manual drive
08:58 - adjustmnet
10:37 - continue in installation
14:26 - Test
16:30 - Outro
#airbus #airbus321 #a320 #a321 #aircraft #a321neo #aircraftmaintenance #howto #aircraftmaintenanceengineer #aircraftlovers #airbuslovers #aircraftengineer #aircrafttechnician #airconditioning #aircrafttechnician #aviationgeeks #aviationgeeksociety #aviationphotography #aviationdaily #zeto.r #APU #auxiliarypowerunit #breakdown #components #aircraft #aircraftengineers #aircraftmaintenace #wefixyoufly #learningeveryday #creatingjourneystronger #austrianairlines
The air intake system provides ambient air of sufficient quantity and quality to the APU. Its major components are:
- a diverter,
- an air inlet (including actuator-driven flap),
- an air duct.
The main function of the air intake system is:
- provide sufficient mass flow to the APU plenum chamber,
- minimization of pressure loss and flow distortion (thus also reducing the danger of APU surge),
- noise reduction,
- reduce the potential for foreign object ingestion,
- prevent exhaust (from APU and main engines) from re-entering the inlet,
- prevent the ingestion of fluids existing externally,
- prevent the accumulation of flammable fluids in the intake system.
Air Inlet
The air inlet assembly is installed as a unit in a cutout in the bottom of the tailcone just forward of the APU compartment, positioned by 4 bolts. The interface to the air duct is attached to the APU compartment forward firewall. The inlet airstream area up to approximately 150mm (6in) forward of the interface to the APU compartment is covered with a CRES face sheet to serve as an extension of the APU compartment fireproof area. A fireproof gasket is used to join the air inlet assembly to the APU compartment firewall.
Air Inlet actuator
This electrically operated linear actuator operates the air inlet flap. Its major components are:
- 28V DC motor with brake control (basic version),
- a limit switch at each end position,
- a flap position switch at each end position,
- thermal overload protection device.
Reason for replacement: troubleshooting
My Flashlights Fenix LD45R:
fenixlighting.com/products/fenix-ld45r-adjustable-beam-flashlight
My Headlight Fenix HL45R:
fenixlighting.com/products/fenix-hl45r-rechargeable-headlamp
where you can find me:
Instagram:
instagram.com/zeto.r
tiktok:
tiktok.com/@zeto.r
Patreon:
patreon.com/Zetomaintenance?utm_campaign=creatorshare_creator
linkedin.com/in/tom%C3%A1%C5%A1-zeman-1861a094
———-Video content———————
00:00 - Intro
00:17 - where we can find air inteke actuator and what is around
01:42 - Removal of the cat walk
02:08 - Retraction of the Actuator
02:40 - Removal of the actuator
07:01 - how the flap looks
07:48 - Installation of the Actuator
08:30 - why we need manual drive
08:58 - adjustmnet
10:37 - continue in installation
14:26 - Test
16:30 - Outro
#airbus #airbus321 #a320 #a321 #aircraft #a321neo #aircraftmaintenance #howto #aircraftmaintenanceengineer #aircraftlovers #airbuslovers #aircraftengineer #aircrafttechnician #airconditioning #aircrafttechnician #aviationgeeks #aviationgeeksociety #aviationphotography #aviationdaily #zeto.r #APU #auxiliarypowerunit #breakdown #components #aircraft #aircraftengineers #aircraftmaintenace #wefixyoufly #learningeveryday #creatingjourneystronger #austrianairlines
