—Note—
If a replacement auxiliary pump/motor assembly is not installed prior to
the next flight, cover the auxiliary pump switch on the instrument panel
with an "INOP' placard
h. Install replacement auxiliary pump/motor assembly by reversing the removal procedure.
—Caution—
Do not overtighten motor electrical terminal screws.
10-27. INFREQUENT AIRCRAFT OR AUXILIARY PUMP USAGE.
If the aircraft has been idle or the auxiliary pump has not been used for six months or more, the auxiliary pump
should be checked out prior to IFR flight as follows:
a. Turn on the auxiliary pump and let it run continuously for approximately 20 minutes. (This can be
done on the ground with the engine running or with an APU attached).
—Note—
An inflight operational test of the auxiliary air pump should be limited to
30 seconds or less. Continuous operation in flight when the engine
driven pump is running is not recommended.
b. After running the pump continuously for approximately 20 minutes, check the entire system for proper
operation according to section 10-23
10-28. ANNUNCIATOR LIGHT REPLACEMENT.
The annunciator lamps (P/N F7-94-1) in the auxiliary pump control switch are the sub-miniature T-1 3/4 flange
base (type 330, or MS25273 - 330). To replace the lamps, pull the button off the switch and remove the lamps.
Insert new lamps and press the switch button back in place.
10-29. ENGINE CLEANING PRECAUTIONS.
Protect the engine driven and auxiliary air pumps and manifold before cleaning the engine compartment.
Cleaning solvents can enter the pneumatic system through the components and can reduce air pump life.
—Caution—
During engine cleaning, do not blast pneumatic system components
with high pressure solvents of allow protective wraps to become
saturated with solvents. Either case may allow fluid to enter the system
and contaminate the pumps and manifold.
THIS SPACE INTENTIONALLY LEFT BLANK
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
I N S T R U M E N T
2B19