Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 696 / 1956

PAGE 22
Feb 28/07 30-10-00
3J8
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
5. Pneumatic Deice System Adjustments and Test
(PIR-PPS60054-5, -6, -7.)
WARNING: DURING ANY ENGINE OPERATION SPECIFIED HEREIN, EXERCISE CAUTION TO
AVOID HARM OR DAMAGE TO PERSONNEL AND EQUIPMENT BY THE PROPELLER
AND PROPELLER BLAST.
A. Start the engine and operate at 2,500 rpm ( except in S/N’s 4636021 thru 4636131 - use 2,000 rpm).
B. Remove the vacuum hose (suction side) from the right vacuum regulator and adjust the left vacuum
regulator to provide a vacuum gauge indication of: 4.8 (min.) (
S/N’s 4636132 and up ); or, 4.8 to 5.0
( S/N’s 4636001 thru 4636131 ) inches Hg. of vacuum on the analog gauge and record the reading.
In S/N’s 4636021 and up , verify the VACUUM No. 1 INOP annunciator is illuminated and the
VACUUM No. 2 INOP annunciator is not. In S/N’s 4636001 thru 4636020 , the left indicator button in
the vacuum gauge shall be in (indicating pump is operating). Reconnect the right vacuum regulator.
C. Remove the vacuum hose (suction side) from the left vacuum regulator and adjust the right vacuum
regulator to provide a vacuum gauge indication of: 4.8 (min.) (
S/N’s 4636132 and up ); or, 4.8 to 5.0
( S/N’s 4636001 thru 4636131 ) inches Hg. of vacuum on the analog gauge and record the reading.
In S/N’s 4636021 and up , verify the VACUUM No. 2 INOP annunciator is illuminated and the
VACUUM No. 1 INOP annunciator is not. In S/N’s 4636001 thru 4636020 , the right indicator button
in the vacuum gauge shall be in (indicating pump is operating). Reconnect left vacuum regulator.
D. In S/N’s 4636132 and up , with both regulators connected and both vacuum pumps operating, adjust
the left and right regulators equally to obtain a vacuum gauge analog indication of 4.80 inches of
Hg. Verify that the vacuum gauge indicates from 4.80 to 5.20 inches Hg. with engine operating at
idle and 2,000 rpm.
In S/N’s 4636001 thru 4636131 , check that vacuum gauge indication does not exceed 5.2 inches
Hg. with both pumps operating and both regulators connected. If indication exceeds 5.2 inches,
readjust the left and right vacuum regulators, per B and C above, to provide an indication of no
more than 5.2 inches Hg.
E. Check all surface boots and ensure they are down tight against the wing and tail surfaces.
F. Using a vacuum (or combination pressure/vacuum) gauge connected to a hypodermic needle,
measure the vacuum in the pneumatic system by inserting the needle in either right or left wing
hose connections located on cabin side of the forward pressure bulkhead.
G. Remove the vacuum gauge and install a pressure gauge at the same point. (This is not required if
pressure/vacuum gauge is used.)
H. Disconnect one of the vacuum pump pressure hoses from the pressure manifold (fwd of the
firewall) and cycle the SURFACE DE-ICE switch ON to activate the system and check for air
indication of 14 - 0, + 2 pounds per square inch on the pressure gauge. Reconnect the
disconnected pressure hose and disconnect the other pump’s pressure hose from the pressure
manifold and repeat the system cycle to check for air indication of 14 - 0, + 2 psig. Reconnect pump
pressure hose.
I. Cycle the SURFACE DE-ICE switch ON to activate the system and check for air indication of 14 - 0,
+ 2 pounds per square inch on the pressure gauge.
J. Visually check all boots for proper operation. All cells shall inflate fully. Each segment cycle time
shall be 6 + 2 seconds. Cycle sequence is tail, lower wing, upper wing. The SURFACE DE-ICE
annunciator light shall illuminate and:
in S/N’s 4636021 and up , neither VACUUM No. 1 INOP nor
VACUUM No. 2 INOP annunciator shall illuminate; in S/N’s 4636001 thru 4636020 , both left and
right indicator buttons in the vacuum gauge shall be in during boot operation.
K. Remove the pressure or pressure/vacuum gauge connected in step (f) or (g) above, respectively.