Piper SEMINOLE PA-44-180 Maintenance Manual Download

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ADJUSTMENT OF LANDING GEAR UP/POWER REDUCED WARNING SWITCH. ( W h e n
Equipped with Mute Switch)

When adjusting switch fly the airplane at approach speed 1000 feet AGL. (Refer to the Pilot's Operating

Manual.) 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 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.

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.

1 0 . R eposition 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 MUTE switch. Check that the warning horn stops

sounding and that the GEAR WARN MUTE light illuminates.

1 2 . Extend the landing gear. Check that the GEAR WARN MUTE extinguishes. Remove airlane from

j a c k s .

13. Flight test the airplane to insure proper operation of the gear warning horn with the gear up and power

reduced below 14 + 2 inches of manifold pressure.

REPLACEMENT OF LANDING GEAR UP/POWER WARNING SWITCH. (Refer to Figure 32-25,
Sheet 1 of 2 and Sheet 2 of 2.)

When replacing the switch, either with or without the gear warning mute switch, it is important to

d e t e rmine how many washers are positioned between the micro switch and the bracket so that an equal amount
are used during installation. This is necessary because the switch, when properly positioned, should be:

1 .

In the middle of the a c t uators located on each throttle cable without the mute feature.

2 . In the middle of the cams located on each throttle control lever with the mute feature.

FUNCTIONAL TEST OF THE GEAR RETRACTING SYSTEM.

Before proceeding with the test:
1. Check that the tires and struts are inflated as required.
2. Check that the squat and limit switches are at their proper adjustment.
3. Raise airplane on jacks as explained in Chapter 7.
4. Connect a 12 to 14-Vdc, 60 amperes power source to the aircraft electrical system.

Piper SEMINOLE PA-44-180, Maintenance Manual

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