2.
With the aircraft placed on jacks (refer to Chapter 7), turn the master switch on. Move the gear selector switch to the gear up position to raise the landing gear. Turn the master switch off.
32-60-00 Page 32-83 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
32-60-00 Page 32-84 Revised: December 6, 2002
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THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
3.
Block the nose gear in the up position and slowly pull the free fall knob to relieve the hydraulic pressure and allow the main gear to drop.
4.
With the 'nose gear downlock hook" now in the "up" position adjust the hydraulic cylinder rod end to ensure the cylinder will have 0 to .03 cushion prior to bottoming.
5.
Turn the master switch on and raise the nose gear and remove the block from under the nose gear.
6.
Cycle the gear and determine that the gear lights function properly.
ADJUSTMENT OF LANDING GEAR SAFETY (SQUAT) SWITCH.
The landing gear safety switch, located on the left main gear housing is adjusted so that the switch is actuated within the last quarter of an inch of gear extension.
1.
Compress the strut until 7.875 inches is obtained between the top of the gear fork and the bottom of the gear housing. Hold the gear at this measurement.
2.
Adjust the switch down until it actuates at this point. Secure the switch.
3.
Extend and then compress the strut to ascertain that the switch will actuate within the last quarter of an inch of oleo extension.
LANDING GEAR WARNING (THROTTLE) SWITCHES. LANDING GEAR UP/POWER REDUCED WARNING SWITCH.
This switch will automatically activate a warning horn when approaching for a landing with the landing gear up and the throttles pulled below 14 inches of manifold pressure.
SWITCH LOCATION.
The landing gear up power reduced warning switch is located in the control quadrant behind the throttle stop plate. (Refer to Figure 32-24.) Refer to Chapter 91 for electrical schematic of the Landing Gear System.
ADJUSTMENT OF LANDING GEAR UP/POWER REDUCED WARNING SWITCH.
When adjusting switch fly the airplane at approach speed 1000 feet AGL. (Refer to the Pilot's Operating Handbook.) Use the following procedure:
1.
With the aid of a qualified pilot, fly the airplane to an elevation of 1000 feet above the ground and come to approach speed with propellers set for high rpm. Retard the throttles to 14 ± 2 inches of manifold pressure and mark the quadrant cover adjacent to the throttle levers, in such a manner so that the levers can be returned to the same position after the airplane is landed and the engines shut down.
2.
Place the airplane on jacks and retract the landing gear.
3.
Position the throttle levers at the location which gave the 14 ± 2 inches of manifold pressure per Step 1.
4.
With the master switch turned on, loosen the two mounting screws securing the micro switch to the bracket. Move the switch in the direction necessary to make the warning horn operate and gear warning annunciator light illuminate. Tighten the mounting screws.
5.
With the warning horn operating, depress GEAR WARN MUTE switch. Check that the warning horn stops sounding and that the GEAR WARN MUTE light illuminates.
6.
Advance throttles to a power setting in execess of 14 ± 2 inches of manifod pressure. Check that MUTE light extinguishes. Check that warning system is rearmed by retarding throttle levers to 14 ± 2 inches of manifold pressure, activating alarm horn.
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THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
7. With the warning horn sounding, lower the landing gear. Check that the horn ceases to operate when the gear are down and locked.
9.
Advnace throttles levers beyond the position which gave the 14 ± 2 inches of manifold pressure. Retract the landing gear.
10.
Reposition the throttle levers at the location which gave the 14 ± 2 inches of manifold pressure per Step 1. Check that the warning horn sounds.
11.
With the warning horn operating, depress GEAR WARN MUTE switch. Check that the warning horn stops sounding and that the GEAR WARN MUTE light illuminates.
12.
Extend the landing gear. Check that the GEAR WARN MUTE light extinguishes. Remove airlane from jacks.
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