Piper Cherokee Six - Page 232

PIPER
CHEROKEE SIX
SERVICE MANUAL
8.
With the glide established, turn
the adjustment screw (2) clockwise
until the
gear drops. (First
indication of gear
dropping will be that
the gear unsafe
light comes ON.)
9. Climb
again to a safe
altitude and check
that the gear
drops at the correct
airspeed.
10. Land the
airplane and tighten
the adjustment
screw jam
nut (28).
c. To check adjustment
of electrical
switch, the
following procedure
may be used:
1. Place the airplane on
jacks. (Refer to Jacking,
Section II.)
2. Move the mixture control
back to idle cut-off and the
throttle to full
forward to
prevent gear warning
horn from
sounding during
adjustment.
3. Ascertain
that the
actuator tension
springs are properly
adjusted according
to Step a.
4. Retract
the landing gear
hydroelectrically
by turning the
master switch ON.
raising
the emergency
gear extension lever
and moving the
gear selector switch
to the up
position.
The emergency
gear extension
lever must be retained
in the up position
to keep
the gear up.
5. Check
for proper switch operation
by the following procedure:
(a) Turn master switch ON and move gear selector switch to the up
position. Pump should not operate.
(b) Move the emergency gear extension lever to the up override position.
Pump should operate and gear should retract.
(c)
With selector lever up, slowly
lower emergency gear extension
lever to
allow gear to
drop to down
position. The
pump should not
operate at
any time during
extension.
(d) Turn master
switch
OFF.
6. Check
gear operation in
the normal manner
with the use
of the gear selector
switch.
The
emergency
extension lever
must be
held in the
up override
position.
7. Ascertain
that gear is down
and locked and
remove airplane
from jacks. Then
flight
check the retractable
landing
gear system. (Refer
to Paragraph
5A-14a.)
5A-14a. OPERATIONAL
CHECK
OF RETRACTABLE
LANDING
GEAR
SYSTEM.
a. Maximum Gear
Extend: Place
the gear selector
in the down position
at 150 MPH
(130 Kts).
In approximately
5 to
10 seconds
the three
green
gear lights
should
be on
indicating
that
the gear
is down
and locked.
b. Minimum
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 125 MPH (109
Kts). In approximately
5 to 10 seconds
all the
gear indicating
lights should
be out, indicating
that the gear
is fully retracted.
c. Override Gear Down and Up:
1. Down:
Establish a normal
glide at approximately
130 MPH
(113 Kts), 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.
2. Up: Set
maximum climb power. Maintain
approximately 80 MPH (70 Kts)
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 130 MPH (113 Kts). Release
the override lever and the gear should
remain up.
Revised: 7/29/77
HYDRAULIC SYSTEM
1J16