LOW AIR WARNING LIGHT AND BUZZER NOT OPERATING PROPERLY (Cont)

TM 9-2320-285-24-1

2-19.

INSTRUMENT PANEL TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. LOW AIR WARNING LIGHT AND BUZZER NOT OPERATING PROPERLY (Cont)

Step 3.

Check for continuity of LOW AIR warning light bulb.

a. If bulb is defective, replace (para 2-26b(4)).

b. If bulb is not defective, repair socket and wiring as required (para 2-26b(4)).

Step 4.

Disconnect leads from low air pressure buzzer (para 2-26c(2)).

Connect buzzer to 12 Vdc power source; buzzer should sound.

a. If buzzer sounds, repair buzzer wiring (para 2-26c(2)).

b. If buzzer does not sound, replace buzzer (para 2-26c(2)).

Step 5.

Disconnect low air pressure switch electrical leads (para 2-51c).

Allow air system pressure to build to 100 psi.

Use an ohmmeter to check low air pressure switch for continuity.

a. If continuity is obtained, with air pressure at 100 psi, replace low air pressure switch (para 2-51c).

b. If continuity is not obtained, repair or replace low air pressure switch electrical leads.

5. LOW FUEL INDICATOR LAMP DOES NOT LIGHT WHEN FUEL TANK IS EMPTY

Step 1.

Check if FUEL gage indicates empty.

a. If FUEL gage does not indicate empty, troubleshoot fuel level sender (para 2-21, Malfunction 3).

b. If FUEL gage indicates empty, go to step 2 below.

Step 2.

Check for continuity of LOW FUEL INDICATOR light bulb.

a. If bulb is defective, replace (para 2-26b(3)).

b. If bulb is not defective, go to step 3 below.

Step 3.

Check for loose connections on low fuel warning circuit board.

a. If electrical connections are loose, tighten.

b. If electrical connections are not loose, replace low fuel warning circuit board (para 2-26b(3)).

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