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(1)  Connect the Pitot-static leak-tester to the Pitot-static probe. 
(2)  Apply a partial vacuum to the static port until you get a pressure altitude of 1000 ft above the ambient pressure altitude.  Note the altitude. 
(3)  Let the pressure stabilize. 
(4)  Monitor the system pressure.  The system pressure loss must not be more than 100 ft/min. 
(5)  Compare the test equipment altimeter and the airplane altimeter.  The indication error must be less than shown in Table 1 below. 

Table 1 Altimeter Indication Error
Altitude  Allowable Error 
Sea Level  ±20 ft 
4,000 ft  ±35 ft 
8,000 ft  ±60 ft 
12,000 ft  ±90 ft 
16,000 ft  ±110 ft 
20,000 ft  ±130 ft 

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D. Pitot Test
Follow the test equipment manufacturers' instructions for the use of the test-set. Obey the safety precautions for Pitot-static leak-testing at all times!
Detail Steps/Work Items  Key Items/References 
(1)  Connect the Pitot-static leak-tester to the Pitot-static probe. 
(2)  Apply a pressure to the Pitot port equal to 150 kts. 
(3)  Let the pressure stabilize. 
(4)  Monitor the system pressure.  The leak rate must not be more than 10 kts/min. 
(5)  Compare the test-equipment ASI and the airplane ASI.  The indication error must be less than shown in table 2 below. 

Table 2: ASI Indication Error
Airspeed  Allowable Error 
160 kts  ±4 kts 
100 kts  ±4 kts 
40 kts  ±1.7 kts 

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Navigation
AMM

Section 34-20
Attitude and Direction

1. General
This Section tells you about the equipment which shows attitude and flight direction.
Refer to these Sections for data about the systems:
Section 34-22 Magnetic compass.
Section 34-25 Integrated gyro instruments (turn & bank indicator, attitude gyro (artificial horizon),

directional gyro). Section 34-28 Gyro-compass system, consisting of slaved directional gyro, magnetic azimuth transmitter, slaving control unit, and horizontal situation indicator (HSI).
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Section 34-22
Magnetic Compass

1. General
This Section tells you about the magnetic compass which is used to show airplane direction. Refer to the manufacturer's manuals for more data about the magnetic compass.
2. Description and Operation
The magnetic compass shows the heading of the airplane related to magnetic north. Fluid in the

compass bowl gives damping. Each graduation of the compass is 5°.
A compass deviation card attaches to the compass. Compensating magnets for compass adjustment
are located behind the deviation card holder. The compass lighting comes on when the DIM/BRIGHT
switch is set to DIM.

You must do a test for correct operation of the compass (compass swing):
) After replacing a major component.
) After replacing the compass.
) After modification to the airplane.
) After a lightning strike has been reported.
) If the airplane has been parked for more than 90 days.

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Trouble-Shooting
1. General
The table below lists the defects you could have with the magnetic compass. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
　
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