AUXILIARY VACUUM PUMP (SERIAL NUMBERS 8611001 AND UP) (figure 37-1)
—CAUTION—
Replace auxiliary vacuum pump/motor assembly with a new,
working unit, or send unit to vendor for repair. It is important
that pump/motor assembly be repaired by trained personnel, to
ensure proper operation.
The auxiliary vacuum pump, mounted on the firewall, provides a backup source to operate gyro flight
instruments should engine driven pump fail. A 20 amp circuit breaker in system protects pump/ motor circuit,
and a 5 amp circuit breaker protects annunciator light switch.
AUXILIARY VACUUM PUMP, ENGINE OFF OPERATIONAL CHECK
—CAUTION—
Be sure that all electrical equipment is off before beginning
engine off operational check and run auxiliary pump only for a
short time. Excessive time of operation will weaken battery.
1. Press battery master switch ON. Check that VAC OFF annunciator lights.
2. Press VAC OFF/ AUX ON annunciator switch. Check that AUX ON annunciator lights, and VAC OFF
annunciator goes out. Check that vacuum gauge reads between 4.8 and 5.2 in. Hg.
3. Press VAC OFF/ AUX ON annunciator switch to cycle pump OFF. Check that AUX ON annunciator
goes out, and VAC OFF annunciator lights.
4. Press battery master switch OFF.
THIS SPACE INTENTIONALLY LEFT BLANK
37 - 22 - 00
Page - 37-09
Reissued: August 1, 1986
2E11
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
