Pressurization Check With Test Unit - Piper Cheyenne IIIA Airplane Maintenance Manual

2.50
DIA
Rate of Flow
Indicator
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Pressurization Control (continued)
3. Pressurization Check with Test Unit (continued)
3.75
1.25 DIA
Fabricated Reducer Pressure Test Adapter
Figure 501
NOTE: This unit must be purchased
from Piper. This unit is
designated with a Piper Part
Number 756 344.
NOTE: The flow rate valve must be
set in full pump bypass
before starting or stopping
unit.
I
Cabin Differential
Pressure Indicator
Cabin Reference -
Instrument Air
Pressure Indicator
Fill Port Instrument -
Air
Pneumatic Air or
Presssure Air
0
Indicator
Rate of
Climb
-
Indicator
Flow Rate
Valve
2
Circuit Breaker
-S ta rt B u tto n
Stop Button
Electrical Connection
Shop Air -
Air Regulator
Valve
FRONT VIEW
BACK VIEW
Cabin Pressure Test Unit (Typical)
Figure 502
EFFECTIVITY:
040-999
21-30-00 Jan
10/90 21-30-00
Jan 10/90