Piper Navajo PA-31 Service Manual page 241

The time delay switch does not affect or shut off the flap motor if
a failure occurs when the left flap is between the up and down
limit switches.
The time delay switch is passive in the flap electrical system during
normal flap operation.
d.
Reinstall the access plates in the left wing false spar at stations 92.5 and 101.0.
C 764
NACELLE FLOOR
FLAP
PIPER NAVAJO SERVICE MANUAL
5-68. INSPECTION OF TIME DELAY SWITCH OPERATION. This inspection should be done after the
flaps have been rigged and checked for normal operation. The time delay switch is installed in the flap
electrical system so that when the flap switch is actuated (flaps completely extended or retracted), and if
after one second the left flap does not move off the limit switches, the time delay switch shuts off the flap
motor. The right flap will travel approximately 9 degrees.
a.
Lower the flaps and remove the access plates to the limit switches in the left wing false spar at
stations 92.5 and 101.0.
b.
With the flaps part way down, depress the up limit switch and select flap down. The system
should shut down within one second. With the limit switch still depressed (If the limit switch is opened, the
time delay switch will reset and allow the system to become operative), return the flap selector switch to
neutral position and again select flaps down. The system should be inoperative. Determine that the flap
travel was not more than 9 + 1 degrees.
c.
Repeat Step b except depress the down limit switch and select flaps up. The system should again
shut down in one second and the flap travel should not exceed 9 ± I degrees.
NOTE
The only way that further right flap extension can occur after the
time delay switch shuts off the motor, is if the pilot would cycle
the master switch off and on, and again select flaps.
.73 INCHES
I
Figure 5-17. Flap Rigging Check
Revised: 10/12/83
SURFACE CONTROLS
Effectivity
1
K1
DUKES