COWL - AIR INTAKE - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General

Air Intake Cowl ** ON A/C NOT FOR ALL

Air Intake Assembly - Details ** ON A/C NOT FOR ALL

Air Intake Cowl ** ON A/C NOT FOR ALL

The air intake cowl structure is an interchangeable aerodynamically faired assembly which is mounted on the front of the engine fan case.
The assembly is composed of:

an inner and outer barrel,
a nose lip,
a forward and aft bulkhead.

The assembly also includes installation of:

the anti-icing ducting,
the phone jack,
the P2/T2 probe,
hoisting provisions,
Air Intake Cowl ** ON A/C NOT FOR ALL
a drainage provision,
air intake collecting atmospheric air to ventilate the fan case compartment (zone 1).

** ON A/C NOT FOR ALL

2. Description

A. Air Intake Cowl Configuration

Air Intake Cowl - Cross Section ** ON A/C NOT FOR ALL

The outer skin assembly of the intake cowl is constructed of a carbon fiber composite solid laminate.
The inner barrel consists of acoustically treated carbon fiber composite/Nomex honeycomb which is bolted to the engine fan casing front flange.

The aft bulkhead and nose lip/forward bulkhead assembly connect the outer barrel to the inner barrel.

B. Air Intake Cowl Anti-Icing

Air Intake Assembly - Details ** ON A/C NOT FOR ALL

Air Intake Cowl ** ON A/C NOT FOR ALL

Air Intake Cowl - Cross Section ** ON A/C NOT FOR ALL

A piccolo tube is mounted in the air intake cowl lip and distributes anti-icing air into the lip inner surface.
The anti-icing air is supplied to the piccolo tube by a supply tube that penetrates the forward and aft bulkheads (Ref. AMM D/O 30-21-00-00).

C. Air Intake Cowl Structure
The majority of the internal pressure loads and internal air loads are taken in hoop tension through the inner barrel skins.
The longititudinal and transverse loads are distributed into the fan case forward flange through a bolted joint.
The acoustic panels are structural and carry air intake cowl loads.
The air intake cowl aft bulkhead forms a land on which the fan cowl doors leading edges are supported when closed.

NOTE: Four dowels are used to ease alignment. 36 bolts on the engine flange enable removal/installation of the engine air intake cowl

Air Intake Cowl ** ON A/C NOT FOR ALL

D. Air Intake Cowl Materials

Air Intake Cowl - Cross Section ** ON A/C NOT FOR ALL

A1 and A5 (serial Nos. N5001 to N7408): The intake cowl aft bulkhead and the rear of the inner barrel are constructed of carbon composite sandwich and together provide a firewall barrier to the fan case compartment (Zone 1).
A5 (serial Nos. N7409 and sub.): The intake cowl aft bulkhead is constructed of titanium and the rear of the inner barrel is constructed of carbon composite sandwich, and together provide a firewall barrier to the fan case compartment (Zone 1).

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! COMPONENT ! MATERIAL !

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! INNER BARREL ! Graphite/epoxy/Nomex/honeycomb !

! OUTER LIPSKIN ASSEMBLY ! Graphite/epoxy composite !

! LIP ASSEMBLY ! Aluminium alloy (2219) !

! AFT BULKHEAD/FIREWALL ! Carbon/epoxy honeycomb sandwich !

! A1 and A5 (serial Nos. N5001 to N7408) ! rear face covered with siltemp !

! ! (fire resistant material) !

! AFT BULKHEAD/FIREWALL ! Titanium (AMS 4901) !

! A5 (serial Nos. N7409 and sub.) ! !

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[Rev.10 from 2021] 2026.04.01 02:28:42 UTC