(d)
Apply a continuous bead of the adhesive to the bond area of the gasket. 1) A bead width of 15 mm (0.6 inches) gives the best bond. 2) Make sure you do not apply the adhesive out of the bond
area. 3) Make sure that no part of the bond area is more than 12 mm
(0.5 inches) away from the adhesive.
(e)
Put the new gasket, with the adhesive side up, against the lower spacer immediately after the adhesive is applied.
(f)
Apply a light pressure to the gasket so that all parts of the gasket are bonded to the spacer.
(g)
Do not apply a pressure that will make the adhesive move out of the bond area.
(h)
Let the adhesive cure for at least 24 hours at between 65° and 100° F, with a minimum relative humidity of 20 percent.
NOTE: The bond will smell of acetic acid until it is fully
____
cured.
E. Install the ground connector
S 434-010
(1)
Apply the sealant to the inside surface of the spacer and the airplane skin.
S 424-011
(2)
Put the ground connector into position, with all of the holes aligned.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-21-02
ALL ú ú 01 Page 404 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 434-012
(3)
Install the bolts and washers to the flange between the ground connector and the check valve assembly.
S 434-013
(4)
Fillet seal the flange with the sealant.
F.
Do the installation test for the ground connector
S 484-014
(1)
Supply conditioned air from a ground cart (Ref 21-00-00).
S 214-015
(2)
Feel for leaks around the connector joint.
(a)
Small leaks are permitted.
(b)
You must repair a large leak.
G.
Put the airplane back to its usual condition
S 414-016
(1)
Install the aft bulkhead lining of the forward cargo compartment (AMM 25-50-03/401).
S 414-017
(2)
Close the forward cargo door, 821 (Ref 06-46-00).
S 084-018
(3)
Remove the supply of conditioned air from the ground cart (Ref 21-00-00).
S 414-019
(4)
Close the access dooor for the ground connector, 193DL
(Ref 06-41-00).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-21-02
ALL ú ú 01 Page 405 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
FLIGHT DECK CONDITIONED AIR DISTRIBUTION - DESCRIPTION AND OPERATION
____________________________________________________________________
1. General (Fig. 1)_______
A. The flight-deck-conditioned-air-distribution system supplies conditioned air to the flight deck to provide a comfort-controlled environment for the flight crew. The system consists of a flight-deck-conditioned-air-distribution duct, floor registers, individual crew gaspers, windshield diffusers, and an overhead register.
(1)
The conditioned air is supplied to the flight deck area by the flight-deck-distribution duct. Then it is distributed throughout the flight deck by the registers, gaspers, and the windshield diffuser.
B.
Conditioned air from the left-pack-outlet duct (Ref 21-51-00) flows into the flight-deck-distribution duct before it enters the mix manifold (Ref 21-21-00). In the flight-deck-distribution duct, the conditioned air mixes with trim air (Ref 21-61-00) and flows to the flight deck.
(1)
When the left-air-conditioning pack is not operating, conditioned air can still enter the flight-deck-distribution duct.
(a)
If only the right-air-conditioning pack is used, conditioned air flows into the mix manifold, then exits the manifold through the left-pack-outlet duct and flows into the flight-deck-distribution duct.
(b)
ON GUN 001-004 WITHOUT SB 21-51; If only a ground cart is used, conditioned air flows into the mix manifold, then exits the manifold through the left-pack-outlet duct and flows into the flight-deck-distribution duct (same as the right-air-conditioning pack).
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 空调 AIR CONDITIONING 1(22)
