NOTE:____MIT65B41608 is changed to G21003. G21003 has a new probe for use in a self closing test port.
(a)
Portable differential pressure gage - 0 to 10 inches (254 mm) of water, Wallace and Tiernan Model FA141710, P/N 62C-4C-0010, Belleville, New Jersey
(b)
Static pressure probe (0.20 inch (5 mm) maximum diameter)
C. References
(1) 24-22-00/201, Manual Control
D. Access
(1) Location Zone
114 Nose Gear Well, RH
E. Prepare for the Test
S 865-020
(1) Supply electrical power (Ref 24-22-00/201).
F. Do the Test
S 735-014
(1) Put the static pressure probe into the test port on the E30-2 shelf and measure the static pressure. The minimum acceptable pressure is
3.0 inches (76 mm) of water.
NOTE: The above acceptance value is for standard pressure and
____ temperature. Acceptable conditions for measurement are an ambient temperature of 40°F (4°C) to 90°F (32°C) and -1000 to 2000 feet altitude. If the ambient temperature and altitude are outside of this range then the measured pressure value must be corrected to standard conditions. (Ref Fig 501)
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MAINTENANCE MANUAL
S 735-124
(2) If you use the portable differential pressure gage - 0 to 10 inches (254 mm) of water (Wallace and Tiernan Model FA141710, P/N 62C-4C-0010), make sure the static pressure probe is connected to the high pressure port of the differential pressure gage (PITOT). The low pressure port of the differential pressure gage (STATIC) must be open to the atmosphere.
(a) If the above pressure is less than 3.0 (76 mm) inches of water, do these checks: 1) Make sure there are no leaks at the pressure gauge and the
static probe connections. 2) Make sure all the rack mounted equipment is installed. 3) Make sure there are no leaks in and around the equipment
shelf. 4) Make sure there are no leaks in the air supply ducts. 5) Make sure the air cleaner is clean (Ref 21-58-10/201). 6) Make sure the inlet screens for the supply system and the
supply fan are not blocked. 7) Make sure the fan check valve is installed correctly. (AMM 21-58-03/401). 8) Make sure the supply fan check valve operates correctly (AMM 21-58-03/601).
G. Put the Airplane to its Usual Condition
S 865-015
(1) Remove the electrical power, if it is not necessary
(Ref 24-22-00/201).
TASK 21-58-00-735-045
9. System Test - E1/E2 Rack Pressure
_________________________________
A. Special Tools and Equipment
(1) G21003 - Recirculation Fan Filter Differential Gage
or the equivalent tools listed below:
NOTE:____MIT65B41608 is changed to G21003. G21003 has a new probe for use in a self closing test port.
(a)
Portable differential pressure gage - 0 to 10 (254 mm) inches of water, Wallace and Tiernan Model FA141710, P/N 62C-4C-0010, Belleville, New Jersey
(b)
Static pressure probe (0.20 inch (5 mm) maximum diameter)
B. References
(1) 24-22-00/201, Manual Control
C. Access
(1) Location Zone
114 Nose Gear Well, RH
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747-400 MAINTENANCE MANUAL
D. Prepare for the Test
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