Learjet 35A - ENG CHIP Light Illuminated

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4-12 FAA APPROVED 4-30-76

REISSUED 2-25-81, CHANGE 13

FUEL CMPTR LIGHT ILLUMINATED (CONT)

Affected Engine:

1. FUEL COMPTR Circuit Breaker (ess bus) — Check and reset if

necessary.

2. FUEL CMPTR Switch — Cycle once. If fuel computer does not

come back on line, FUEL CMPTR Switch — OFF.

Fan Speed (N

1) must be 50% to 60% when switching

from Fuel Computer OFF to Fuel Computer On opera-

tion. This procedure prevents RPM droop caused by

rapid dropout of the manual mode governor and the lag

setup of the computer governor.

3. CROSSFLOW Switch — CLOSE.

4. FUS TANK Switches — As follows:

a. XFER-FILL Switch — OFF.

b. FUS VALVE Switch (if installed ) — CLOSE.

5. STANDBY PUMP Switch — ON.

6. JET PUMP Switch — Off.

Use of the standby pump as the primary pump on the

engine with the inoperative fuel computer will prevent

fuel control pneumatic circuit icing by recirculating fuel

within the fuel control.

To crossflow or transfer fuel:

• Monitor turbine (N2) and fan (N1) speed during fuel

transfer.

• Before switching JET PUMP switch to ON, ensure

steady engine operation at 80% N

1 or above.

7. JET PUMP Switch (affected engine) — ON.

8. STANDBY PUMP Switch (affected engine) — Off.

9. Crossflow or transfer fuel as required.

10. STANDBY PUMP Switch (affected engine) — ON.

11. JET PUMP Switch (affected engine) — Off.

ENG CHIP LIGHT ILLUMINATED

Illumination of either the LH or RH ENG CHIP light (if installed) indicates

the presence of metallic particles in the engine oil.

1. Engine Instruments — Monitor for indication of malfunction.

2. Investigate cause at earliest possible maintenance.

NOTE