Piper Arrow IV, Руководство по обслуживанию, Страница: 348 / 752

OPERATIONAL CHECK OF RETRACTABLE LANDING GEAR SYSTEM.
1. Maximum Gear Extend: Place the gear selector in the down position at 130 KIAS for the 201 and 133
KIAS for the 201T. In approximately 5 to 10 seconds the three green gear lights should be on indicating that
the gear is down and locked.
2. Maximum Gear Retract: Allow approximately 8 seconds for the pressure in the hydraulic system to
normalize between gear extension and retraction. Place the selector switch in the UP position at 109 KIAS for
the 201 and 111 KIAS for the 201T. In approximately 5 to 10 seconds all the gear indicating lights should be
out indicating that the gear is fully retracted.
3. Override Gear Down and Up:
A. Down: Establish a normal glide at approximately 120 KIAS for PA-28RT-201T or 110 KIAS for
PA - 2 8 RT-201 with power at idle. Slowly move the override lever down, while observing the
ammeter to confirm that the hydraulic pump does not start. The gear should go down and lock.
Move the gear selector switch down. Release the override lever. The gear should remain down.
B. Up: Set maximum climb power. Maintain approximately 70 KIAS for PA-28RT-201T or 65 KIAS
for PA-28RT-201 for approximately 15 seconds. Move the gear selector switch to the up position.
The gear should not retract. Pull the override lever up. The gear should retract. Allow the airspeed
to increase to at least 115 KIAS for PA-28RT-201T or 110 KIAS for PA-28RT-201. Release the
override lever and the gear should remain up.
4. Gear “Back-Up” Down and Up:
A. Gear Down: Set power at idle. Glide the aircraft at 120 KlAS for PA-28RT-201T or 110 KIAS for
PA-28RT-201. Decrease the airspeed at the rate of 1 knot per second. The gear should start down
between 101 and 109 KIAS for PA-28RT-201T or 93 and 101 KIAS for PA-28RT-201. Place the
gear selector switch down, after the gear is down and locked.
B. Gear Up: Set maximum climb power. Maintain approximately 70 KIAS for PA-28RT-201T or 65
KIAS for PA-28RT-201 for approximately 15 seconds. Move the gear selector up. The gear should
stay down and locked. Increase the airspeed at the rate of 1 knot per second. The gear should begin
to retract between 76 and 84 KIAS for PA-28RT-201T or 73 and 81 KIAS for PA-28RT-201 at
zero density altitude. The speed at which the gear starts up will increase 1 knot for PA-28RT-201T
or I . 3 knots for PA-28RT-201 for each 1000 increase of density altitude.
C. Manual Override Up Latch: With the gear up, the aircraft in normal flight configuration, select up
on the gear override lever. Engage the up latch. The amber up latch warning light, below the gear
selector switch, should be flashing. Gradually slow the aircraft below the auto gear extend speed
and observe that the gear stays fully retracted. Disengage the up latch. The flashing amber warning
light should go out.
5. Gear Indicator Lights:
A. The green lights indicate when the corresponding gear is in the down and locked position. Turn
landing light switch on and off - observe ammeter for indication.
B. The red gear warning light will indicate an unsafe condition. It will indicate when the gear is in an
intermediate position neither fully up nor down. In conjunction with the gear warning horn, it will
indicate when the throttle setting is less than 14 ± 2 inches of manifold pressure while the gear is
not down and locked. It will also indicate when the gear is down and locked while the selector
switch is in the UP position.
6. The Gear Warning Horn: The gear warning horn will sound whenever the red gear warning light is on
and the throttle is closed or below 14 ± 2 in. Hg. of manifold pressure.
7. Micro Switch Check:
A. The aft throttle micro switch setting is checked as follows: with the gear up, reduce the throttle at a
normal rate. The gear warning horn and the red light should come on at 14 inches of manifold
pressure ± 2.
29-10-12
Page 29-27
Revised: February 23, 1979
2C21
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL