(b)
Apply a vacuum to captain's static system on lower right probe (preferred) or drain fitting No. 11 (connection not shown in figure 501).
(c)
For low-range leakage test: 1) Apply a vacuum to the system, so that captain's altimeter indicates an altitude of 3000 feet. 2) After system has stabilized, shut off vacuum using appropriate static cutoff
valve. Read and record altimeter or test indicator reading. 3) Wait 1 minute. Check that vacuum does not decrease more than 60 feet.
(d)
For full-range leakage test:
1) Apply a vacuum equivalent to 12.37 (+ 0.10) inches of mercury (absolute pressure) so that captain's altimeter indicates 22,500 (+ 200) feet. Pitot system should also be evacuated, if necessary, to meet the requirement under the caution note.
2) After system has stabilized, shut off vacuum using appropriate static cutoff valve. Read and record altimeter or pressure indicator reading.
501
May 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-11-0 Page 505
3) Wait 1 minute. Vacuum should not decrease more than 0.21 inches of mercury or 400 feet in altitude.
CAUTION: VACUUM SHOULD BE HELD AS A BACKUP BEHIND CUTOFF VALVE DURING CUTOFF PERIOD. FOLLOWING THIS PERIOD, CUTOFF VALVE SHOULD BE REOPENED. RELEASE OF VACUUM SHOULD BE GRADUAL AND SIMULTANEOUS FOR ALL STATIC SYSTEMS.
(4)
Test first officer's static system for leakage.
(a)
Place shutoff valve in open position.
(b)
Apply a vacuum to first officer's static system on upper right probe (preferred) or drain fitting No. 9.
(c)
Repeat steps E.(3)(c) and (d) above for first officer's static system and altimeter.
(5)
Test auxiliary No. 1 static system for leakage.
(a)
Place shutoff valve in open position.
(b)
Apply a vacuum to auxiliary No. 1 static system on lower right probe (preferred) or drain fitting No. 12.
(c)
Repeat steps E.(3)(c) and (d) above using pressure indicator or altimeter.
(6)
Test auxiliary No. 2 static system for leakage.
(a)
Place shutoff valve in open position.
(b)
Apply vacuum to upper right probe (preferred) or drain fitting No. 8.
(c)
Repeat steps E.(3)(c) and (d) above using test vacuum indicator and altimeter.
(7)
Test for leakage between auxiliary static system No. 1 and captain's static system.
(a)
If captain's altimeter is the electrical type, verify that CADC No. 1 circuit breaker is closed.
(b)
Connect the vacuum source to one of the static ports on the upper left or lower right (preferred) pitot-static probe aft static pressure section or to the drain fitting for auxiliary static system No. 1.
(c)
Seal all ports of captain's static system.
(d)
Apply a vacuum equivalent to 12.37 +0.10 inches of mercury (absolute pressure) (equivalent to an altitude of 22,500 +200 feet).
(e)
After the system has stabilized, maintain the vacuum for 5 minutes.
(f)
Check that the captain's altimeter does not show an increase in altitude.
(8)
Test for leakage between auxiliary static system No. 2 and first officer's static system.
(a)
If first officer's altimeter is the electrical type, verify that CADC No. 2 circuit breaker is closed.
(b)
Connect the vacuum source to one of the static ports on the upper right or lower left (preferred) pitot static probe aft static pressure section, or to the drain fitting for auxiliary static system No. 2.
(c)
Seal all ports of first officer's static system.
(d)
Apply a vacuum equivalent to 12.37 +0.10 inches of mercury (absolute pressure) (equivalent to an altitude of 22,500 +200 feet).
(e)
After the system has stabilized, maintain the vacuum for 5 minutes.
(f)
Check that the first officer's altimeter does not show an increase in altitude.
(9)
Test alternate static system for leakage.
(a)
Place shutoff valve in open position.
(b)
Apply vacuum to right flush to body mounted static ports (preferred) or drain fitting No. 5.
(c)
Repeat steps E.(3)(c) and (d) above using test vacuum indicator and altimeter.
(d)
Remove seals and adapters from captain's and first officer's static systems. Check that static source selector valve is in NORMAL position.
(e)
Repeat steps E.(7) to ensure no leakage through static source selector valve.
500
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