Section VI. TROUBLESHOOTING - TM-55-4920-424-13-P0167

TM 55-4920-424-13&P

SECTION VI

TROUBLESHOOTING

6-1.

GENERAL

6-2.

System troubles listed in figure E-18 may be the result of the probable cause indicated, Many of the troubles listed

are based on practical experience; however, the causes listed are not the only faults that can cause the specified trouble,

Unique situations will require special approaches. Repair instructions recommended in the REMEDY column are

referenced in the applicable paragraph in Section VII. Figure E-18 lists troubleshooting data in the following manner:

a. Trouble. Various troubles that may be encountered during check stand operation.

b. Probable Cause. The probable cause of a particular trouble are listed in the order in which they are most likely to

occur under standard operating conditions.

c. Remedy. Remedies are similarly arranged, but in order of complexity, starting with the simplest remedy. Refer to

the wiring diagram and electrical schematic enclosed in back of this manual when performing electrical checks.

Trouble

Probable Cause

Remedy

Fuel not

Fuel supply low.

Check fuel level, and add

reaching

fuel if necessary.

APU

Loose connections,

Tighten loose connections.

crimps, or restrictions

Clear restrictions, and

in fuel lines.

replace all damaged lines

Restricted fuel

Remove restrictions.

intake tube, or

tank breather

vent dogged.

Defective fuel

Check fuel boost pump for

boost pump.

proper operation.

Fuel filter

Replace filter element.

clogged.

Refer to paragraph 7-8,

for replacement procedure.

Entrapped air

Purge the fuel system.

in the fuel System.

Refer to paragraph

2-6 or 3-8, whichever

purging procedure is

applicable.

(Figure E-18 Sheet 1 of 2)

(Figure E-18 Sheet 2 of 2)

Figure E-18. Table of Troubleshooting Procedures (Sheet 1 of 2)

Change 2 E-51