TM 9-1550-416-14&P
Table 3-4. Troubleshooting - Cont.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check for blown glow plug. It should read approximately 3 on ammeter on powerpanel.
Replace glow plug.
Inspect fuel tank for residue. Cheek vent tube and fuel take-up line in tank for obstructions.
Step 3.
Clear residue from lank and tubes.
Inspect engine to determine if it is worn out, leaking around seals or damaged.
Step 4.
Replace defective engine.
3. ENGINE WILL NOT IDLE.
Step 1. Check fuel. Bad fuel may have moisture, dirt, or sand.
Replace with clean, moisture free fuel.
Step 2. Check needle valve adjustment. It may be too lean.
Adjust needle valve ccw so that the mixture is rich.
WARNING
When performing step 3, ensure that the
glow plug clip is not attached to glow
plug. Injuries could result if engine should
start during this step.
Step 3.
Disconnect glow plug clip. Check that engine parts are tight and not leaking compression. Check
for air bubbles by pouring fuel on the engine as the propeller is turned over by hand.
Tighten head bolts and glow plug.
4. FLIGHT CONTROLS AND/OR THROTTLE DO RESPOND TO COMMANDS.
CAUTION
Do not force control rods or pushrods to
move. Damage to servo gears can result.
Check to see if both transmitter and receiver power switches are set to ON.
Step 1.
Set power switches on transmitter and receiver/servo group to ON.
Step 2.
Check to see if the transmitter band power select switch is set to the proper band and not to train.
Set band power select switch to the proper band.
Check to see if the transmitter RF band switch is set to the proper band.
Step 3.
Set RF band switch to the proper band.
Check to see if transmitter frequency matches receiver frequency.
Step 4.
Set transmitter channel select switch to match receiver channel.
Step 5.
Check transmitter receiver and servo/battery group battery voltage levels.
Charge battery if voltage is below 12 volts per paragraph 2-22. Charge receiver and servo/
Step 6.
Check to see if transmitter or receiver and servo/battery group is operative. Operate transmitter
on a known operational receiver and servo/battery group. If response is not obtained, transmitter
is inoperative. If response is obtained, receiver and servo/battery group is inoperative.
Replace inoperative transmitter or receiver and servo/battery group as appropriate.
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