Corrosion of torque tube bearings

Corrosion of handle mechanism hub and bearings

Corrosion of bearings in emergency power assist
system
Corrosion caused by wet insulation blankets and

slide packs
Corrosion of hatch interiors

Corrosion of alloy steel bearings

Corrosion of cargo door interior and door mech-anisms
Corrosion of panels and adjacent skin

Corrosion of door interior

Corrosion of door interior

SPECIFIC CORROSION PROBLEMS -DOORS Figure 1

INDEX
PREVENTION
VOLUME 2
52-10-01

52-10-01

52-10-01

52-10-01

52-10-01

52-20-01

52-20-01

52-30-01

52-40-01

52-40-02

52-40-03

TERMINATING
ACTION
(IF ANY)

SB 52-0025

SB 52-0027

SB 52-0071

SB 52-0056

Volume 2-757

52-00-01
Page 1 OCT 01/00
CORROSION PREVENTION MANUAL
DOORS

THIS PAGE INTENTIONALLY LEFT BLANK

Volume 2-757

52-00-01

Page 2
OCT 01/00

CORROSION PREVENTION MANUAL
MAIN ENTRY AND PASSENGER DOORS

1. General

A. Areas of possible corrosion are the internal and external structure of the

doors, connection points and mechanisms. Bearings in the mechanisms are a
frequent corrosionproblem.

B. The door openings should be treated at the same time as the doors.

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)Remove liner and gain access to interior structure of door.

(2)Clean out drains and drain paths.

(3)Refer  to Volume 1, 20-60-00 for details on the application of corrosion
inhibiting compound.

(4)Apply  corrosion inhibiting compound to the interior door structure, giv-ing special attention to the lower corners.

(5)Do not apply corrosion inhibiting compounds on grease joints or sealed
bearings. These compounds dissolve grease and other lubricants. They are
penetrating compounds and can get around the seals and into the bear-ings.

(6)Do not apply corrosion inhibiting compounds on interior materials such
as liners. The compounds change the flammable quality of these materi-als.

(7)Relubricate interior door fittings and bearings as necessary per the
maintenance manual.

(8)
Reinstall liner and restore door to normal.

B.
Frequency  of Application. Periodically inspect the door structure and con-dition of the corrosion inhibitor. Reapply corrosion inhibiting compound as
required. Local areas where gouges and scratches have occurred should be
treated at the first opportunity consistent with the maintenance schedule.

C.
　
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