D. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station 727.00 - Left
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station 727.00 - Right
E. Corrosion Prevention
SUBTASK 53-11-37-610-027
(1) General Philosophy
(a) The basic corrosion prevention philosophy is to make the periodic inspection described in
INSPECTION AND DETECTION, SUBJECT 51-00-51 to preclude or detect the early
stages of corrosion. Missing fasteners, white powdery or discolored deposits are
evidences of the existence of corrosion which should alert operators that some corrective
action is required. A corrosion prevention program should be initiated to prevent the
accumulation of moisture or corrosive products in order to minimize the occurrence of
corrosion.
SUBTASK 53-11-37-610-028
(2) Corrosion Inspection/Removal
(a) Following cleaning of suspected areas, a visual inspection utilizing bright lighting and
mirror is effective for identifying the existence of corrosion. In specific localized areas
where inspection by visual means is impossible or where extent of corrosion has to be
determined after visual detection, INSPECTION AND DETECTION, SUBJECT 51-00-51
for applicable method.
(b) Where corrosion exists (noticeable bulges of the skin or white deposits of corrosion
products at fastener heads of joint edges), refer to Structural Repair Manual for details of
corrosion removal.
(c) For minor corrosion, to minimize the downtime of the airplane, the corrosion products
should be cleaned off, followed by the application of a corrosion inhibiting compound into
the affected area to retard the corrosion process (STANDARD PREVENTIVE
MAINTENANCE PROCEDURES, SUBJECT 51-00-59). The finish system should be
restored at the next maintenance opportunity.
SUBTASK 53-11-37-610-029
(3) Application of Corrosion Inhibitors
(a) For details of application of water displacing corrosion inhibiting compound, refer to
STANDARD PREVENTIVE MAINTENANCE PROCEDURES, SUBJECT 51-00-59.
(b) Hydraulic tubing, tubing supports and fittings are to be treated per HYDRAULIC POWER,
CHAPTER 29.
SUBTASK 53-11-37-610-030
(4) Prevention Treatment
(a) Maintenance Prevention
1) At first opportunity consistent with scheduled maintenance activity, corrosion
prevention treatment should be accomplished in the wheel well and on the aft keel
beam.
2) Treatment of the wheel well at the same time as the main gear is recommended.
3) Remove runway debris and generally clean the entire wheel well area.
4) Replace damaged or broken finishes if at all possible. Refer to STANDARD
PREVENTIVE MAINTENANCE PROCEDURES, SUBJECT 51-00-59 for protective
finish systems.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-11-37
Page 221
D633A101-ILF Oct 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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