TM 55-4920-413-13&P
Table 4-2. Troubleshooting (AVUM)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. INPUT POWER INDICATORS DO NOT GOON WITH INPUT POWER SWITCH PLACED ON.
Step 1. Place INPUT POWER switch ON. INPUT POWER 115 VAC and 28 VDC indicators should go on.
a. If both indicators do not go on, forward LTS to higher maintenance.
b. If only one indicator does not go on, check/replace corresponding fuse, paragraph 4-7.
c. If fuse is good, replace lamp, paragraph 4-9.
2. INDICATORS DO NOT GO ON WHEN LAMP TEST SWITCH IS PRESSED.
Step 1. Press LAMP TEST Switch, LOW OIL PRESS NO. 1 and NO. 2, HIGH OIL TEMP NO. 1 and NO. 2,
ENGINE OUT NO. 1 and NO. 2, LAMP SUPPLY OVERLOAD NO. 1 and NO. 2, and LOW ROTOR
SPD indicators should go on.
a. If no indicators go on, send LTS to higher maintenance.
b. If only one indicator does not go on, replace lamp, paragraph 4-9.
Section III. REPAINTING AND REFINISHING INSTRUCTIONS
Observe all cautions and warnings on containers
when using consumables. When applicable, wear
necessary protective gear during handling and
use. If a consumable is flammable or explosive,
MAKE CERTAIN consumable and its vapors are
kept away from heat, spark, and flame. MAKE
CERTAIN helicopter is properly grounded and
firefighting equipment is readily available prior to
use.
4-4. Cleaning Instructions.
a. Remove dust and loose dirt with a clean, soft cloth, item
4, App D.
b. Remove grease, fungus, and ground-in dirt with cloth
dampened with dry-cleaning solvent, item 3, App D.
c. Remove moisture with a dry cloth.
4-5. Repainting and Refinishing Instructions.
NOTE
Refer to TB 746-10, Field Instructions for Paint-
ing and Preserving Electronics Equipment.
a. Repaint test set using these colors:
(1) Case (exterior). Finish with two coats of yellow baked
enamel, item 1, App D.
(2) Front panel. Retouch using instrument black enamel,
item 2, App D.
4-2
