1. General
A. There are two lavatory service panels located at BS418 and BS1180. The area
adjacent to and aft of the lavatory service panel and the door are suscepti-ble to staining and corrosion due to leakage from the lavatory drain.
2. Corrosion Prevention
A. After servicing the toilet tank, the lavatory service panel area should be
flushed with clean water.
B. Inspect lavatory service panel and fuselage skin aft of panel for damaged
finish and corrosion annually.
C. For minor corrosion detected during the periodic inspections and to minimize
the downtime of the airplane between overhaul cycles, apply a corrosion
inhibiting compound per Volume 1, 20-60-00. Excess material should be wiped
off with a clean, dry rag after 30 minutes.
D. Where extensive corrosion exists, remove corrosion per Structural Repair
Manual for lavatory service panel and Structural Repair Manual for fuselage
skin.
Volume 2-757
52-40-01
Page 1
OCT 01/00
CORROSION PREVENTION MANUAL
LAVATORY SERVICE PANELS
AFT SERVICE PANEL SHOWN FORWARD PANEL SIMILAR
DETAIL I
Lavatory Service Panels
Figure 1
Volume 2-757
52-40-01
Page 2
OCT 01/00
CORROSION PREVENTION MANUAL
FORWARD ACCESS DOOR
1. General
A. The forward access door has a corrosion protective finish that consists of
chemical finish (Alodine) on clad aluminum parts, anodize surface treatment
on non-clad aluminum parts, a coat of BMS 10-11, type I, primer and a coat
of BMS 10-11, type II, enamel. Faying surfaces of dissimilar metals and
parts attached to the door skin are fay sealed with BMS 5-95 sealant. All
areas of possible moisture accumulation are drained or filled with BMS 5125
leveling compound. The exterior surface of the door is unfinished during
production unless otherwise requested by the operator.
B. Areas of possible corrosion are the internal structure of the door, connec-
tion points and mechanisms.
C. The door should be treated at the same time as the door opening.
2. Corrosion Prevention
A. Make periodic inspections as described in Volume 1, 20-20-00 to ensure that
the protective finishes provided during manufacture remain intact.
(1)Gain access to interior structure of the door.
(2)Clean out drains and drain paths. Check condition of leveling compound
(Ref Component Maintenance Manual, 52-48-44).
(3)Check that drain valve is free to open and close.
CAUTION: EXCESSIVE TIGHTENING OF PLUNGER TYPE DRAIN VALVE WILL CAUSE VALVE
FLANGE TO CRACK OR BREAK.
(4) If required, remove plunger type drain valve from outside of door, clean
out obstructions and reinstall valve until flange contacts skin. Tighten
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 防腐手冊 CORROSION PREVENTION MANUAL(18)
