CHART 3203. TROUBLESHOOTING (EXTENSION & RETRACTION) (Sheet 5 of 5)
Trouble Cause Remedy
Gear stops part way up, but Pump high pressure relief Replace pump. pump continues to run. valve out of adjustment.
Internal leakage of system. Check free fall valve for internal leakage.
Check gear actuating cylinders for internal leakage.
Check for broken or damaged hydraulic lines.
Hydraulic fluid in reservoir Fill reservoir with below operating level. hydraulic fluid.
All gears fail to free fall. Free fall valve fails to open. Check valve and cables connections. Replace valve or connect cables.
With gear selector down and Shorted gear up solenoid. Replace solenoid.
three green lights on, gear
unsafe light comes on
intermittently or continuously.
With gear selector down and Shorted gear up solenoid. Replace solenoid.
three green lights on, pump
motor circuit breaker opens.
With gear unsafe light on, Shorted gear down solenoid. Replace solenoid. pump operates on and off.
With gear unsafe light on, Shorted gear down solenoid. Replace solenoid. pump motor circuit breaker opens.
32-30-00 Page 32-59 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
FUNCTIONAL TEST OF THE GEAR RETRACTING SYSTEM. SET-UP
Before proceeding with the test:
A. Check that the tires and struts are inflated as required.
B. Check that the squat and limit switches are at their proper adjustment.
C. Raise airplane on jacks as explained in Chapter 7.
D. Connect a 12 to 14-Vdc, 60 amperes power source to the aircraft electrical system.
PROCEDURE
Carry out the following procedures in the sequence designated, because each instruction is a prerequisite for the one following it. Should the system fail to respond as specified, find the malfunction and correct it before continuing.
A. Keep hydraulic reservoir full of fluid. Make provisions to add fluid to the reservoir as necessary
B. Make sure all switches are off and that the gear selector is in the down position.
C. Position the BATT Mastr switch on.
D. Check that the three green safe lights at the bottom center of the panel are lit, the red warn gear unsafe light at the top of the panel is off, the gear warning horn is off, and hydraulic pump does not operate. Check that the GEAR WARN MUTE annunciator light is OUT.
E. Check flaps are retracted. Move the gear selector switch to the up position.
F. Check that the green safe lights are off, the red warn gear unsafe light is on, and the warning horn is on. After all gear are retracted fully with the nose gear doors closed, check that the red warn gear unsafe light is off, the pump motor stops running, and that the warning horn is still on.
(1)
Depress gear warning mute switch.
(2)
Check that the gear warning horn is off, that the GEAR WARN MUTE annunciator light is lit,
(3)
Move both throttles to the mid travel position. Check that the GEAR WARN MUTE annunciator light is off.
(4)
Close both throttles. Check that the gear warning horn is ON
G.
Move the left throttle to the mid position. With right throttle closed and gear fully retracted:
(1)
The gear warning horn should remain on.
(2)
Depress gear warning mute switch.
(3)
Check that the gear warning horn is off and that the GEAR WARN MUTE annunciator light is lit,
(4)
Move right throttle to mid position. Check that the GEAR WARN MUTE annunciator light extinguished.
(5)
Close right throttle. Check that the gear warning horn is ON
32-30-00 Page 32-60 Revised: December 6, 2002
2I12
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
H. Close left throttle and move right throttle to mid travel position.
(1)
The gear warning horn should remain on.
(2)
Depress gear warning mute switch.
(3)
Check that the gear warning horn is off and that the GEAR WARN MUTE annunciator light is lit,
(4)
Move left throttle to mid position. Check that the GEAR WARN MUTE annunciator light extinguished.
(5)
Close left throttle. Check that the gear warning horn is ON
I. Move both throttles to their mid travel positions.
J. The warning horn should go off.
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