CHAPTER 10 FUEL SYSTEM

ACIWBDR Wiring Repair Set Permanent Repair Capabilities (One Hour/One Flight) (Continued)

Figure 10-1. Fuel System Assessment Logic

TM-1-1520-240-BD Army CH-47D Heilcopter (NSN 1520-01-088-3869) (EIC:RCD) Manual
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TM 1-1520-240-BD CHAPTER 10 FUEL SYSTEM SECTION I. GENERAL 10-1. INTRODUCTION . This chapter provides methods for assessing battle-damage, deferring damage repair, and repairing fuel systems. The primary emphasis is on providing the assessor with the proper guidance to perform the assessment process. Simplified logic trees and related illustrations will also aid the assessor. SECTION II. DAMAGE ASSESSMENT 10-2. DAMAGE ASSESSMENT PROCEDURE. Each fuel tank must be carefully evaluated and classified. Examine both confined areas and open areas exposed to the airstream. Determine which leaks require immediate repair before flight and which leaks are not a flight hazard. Determine the exact location of a leak and thoroughly examine the leak area. Refer to Figure 10-1 for assessment logic. 10-3. DEFERMENT. Scheduled maintenance may be deferred. Unscheduled maintenance such as the repair of systems and subsystems which are not critical to mission accomplishment, may be deferred if safety of flight is not significantly degraded. Requirements must be examined to determine if relaxed standards for repair and aircraft performance can be accepted. The commander may defer combat maintenance and battle damage repair, even if doing so places operational limitations on the aircraft. SECTION III. BATTLE-DAMAGE REPAIR 10-4. FUEL TANKS. Battle-damage repair of fuel tanks is limited to those repairs specified in this manual. 10-5. FUEL SYSTEM SEALS. Preformed packings removed during fuel system component maintenance may be reused if they are not damaged or swelled to a point where they do not fit snugly into the preformed paddngs groove. Swelled preformed packings may be reused if they are allowed to dry and shrink to the original size. Seals composed of rubber inserts may be reused if they are not damaged or if compression set is not more than 60 percent when compared with a new gasket. CAUTION Reused preformed packings and seals must be inspected after every flight for leakage until replaced. 10-1

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