Piper WARRIOR III PA-28-161 Pilot Operating Handbook page 182

SECTION 9
SUPPLEMENT 1
SECTION 1 - GENERAL
This supplement supplies information necessary for the operation of the
airplane when the optional Piper Auxiliary Vacuum System is installed. The
information contained within this supplement is to be used in conjunction with
the complete handbook.
SECTION 2 - LIMITATIONS
1. The auxiliary vacuum system is limited to standby function only.
Take off with the engine driven dry air pump inoperative is not
approved.
2. Discontinue flight in instrument meteorological conditions (IMC)
if vacuum pressure falls below 4.8 In. Hg.
3. The auxiliary pump/motor assembly and elapsed time indicator
must be removed from service after 500 hours accumulated
operating time or 10 years, whichever occurs first.
SECTION 3 - EMERGENCY PROCEDURES
LOSS OF VACUUM SUCTION - Vacuum inop (VAC) annunciator
and VAC OFF warning lamp lit
1. Vacuum gauge..................................Check to verify inoperative pump.
If vacuum gauge reads below 4.5 inches of mercury:
2. Auxiliary vacuum switch ..............................................Press AUX ON.
3. Verify vacuum pressure of 4.8 to 5.2 inches of mercury.
4. Verify VAC inop annunciator and VAC OFF lights go out.
Compass error may exceed 10 when auxiliary
vacuum system is in operation.
5. Electrical load ............................................................................Monitor
a. Verify alternator capacity is not being exceeded.
b. If required, turn off nonessential electrical equipment.
REPORT: VB-1565
9-4
PIPER AIRCRAFT CORPORATION
CAUTION
PA-28-161, WARRIOR III
ISSUED: JULY 1, 1994