(c)  
ON GUN 001-004 WITH SB 21-51; AND GUN 005-999; if only the ground cart is used, the conditioned air can flow from the ground-service-connector duct into the flight-deck-distribution duct before it enters the mix manifold.

 2.  Component Details
_________________
 A.  Floor Registers
_______________
 (1)  
The flight deck floor perimeter contains four floor registers. The floor registers consist of a housing enclosing a restrictor and diffuser. A cover caps the housing on both ends and a perforated aluminum sheet with a staggered hole pattern makes up the diffuser.

 (2)  
All outlets attach to flexible ducting. Air flows through the flexible ducting into the outlets. The outlets then disperse the air throughout the flight deck.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

OVERHEAD PANELS REGISTER OVERHEAD WINDSHIELD DIFFUSER
INDIVIDUAL GASPERS
FLIGHT DECK DISTRIBUTION DUCT
FLOOR REGISTERS (4)
AIR INLETS (SHOULDER AIR HEATERS) 21-45-01
FLIGHT DECK CONDITIONED AIR DISTRIBUTION
MIX MANIFOLD
1
FLIGHT DECK DISTRIBUTION DUCT
TRIM AIR (REF)
LEFT PACK OUTLET DUCT
GROUND SERVICE CONNECTOR (REF) FLIGHT DECK AIRFLOW
GROUND SERVICE
(VIEW LOOKING FWD)
CONNECTOR DUCT
MIX MANIFOLD BAY 1
NOT ON ALL AIRPLANES
Flight Deck Conditioned Air Distribution System
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 B. Overhead Register
_________________
 (1)  
The overhead register mounts in the ceiling of the flight deck, in between halves of the overhead circuit breaker panel P11. The overhead register consists of a plenum enclosing an acoustic baffle and register assembly. The baffle, made of perforated needle nomex felt, bonds to the top of the register assembly. The baffle prevents excess noise by restricting the airflow through the register. The register assembly, made of formed plastic, attaches to the plenum flanges. The register assembly directs airflow in three different directions within the flight deck. Silicon sponge seals, between the plenum and the register, ensure an air-tight assembly.

 (2)  
Conditioned air enters the overhead outlet from two inlet ducts on the top side of the plenum. Air then flows through the baffle and the nozzle disperses the air to the flight deck.

 C.
Windshield Diffuser

___________________
 (1)  
The overhead dripshield contains the forward windshield diffusers. The diffusers incorporate an airflow straightener, a baffle plate, and a nozzle to ensure uniform distribution of air over the windshield.

 (2)  
The sidewall panels contain the side window diffusers. The
 diffusers consist of a nomex honeycomb air grille.

 D.
Gaspers

_______
 (1)  
The flight deck has four adjustable gaspers. There are 2 gaspers in the forward end of the cockpit, on the outboard side of the captain's station and first officer's station, respectively. A third gasper is located below and aft of the number 3 window, on the left side of the cockpit. The fourth gasper is mounted in the ceiling, to the right of the overhead circuit breaker panel P11. All gaspers consist of a drilled ball within a socket and an adjustable valve to control airflow volume.

 E.
Air Inlets

__________
 (1)  Four air inlets, two on each side of the flight deck (L, R) provide supplemental heated air to the flight deck. The inlets are made of epoxy resin-impregnated aramid fabric.
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