TM 10-1670-305-23&P
0018 00-3
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
0018 00
PMCS
Interval periods are defined as follows:
B-Before Operation
D-During Operation
A-After Operation
Table 2. Preventive Maintenance Checks and Services for Test Chamber Assembly, Model 452
Interval
Item
No.
B
D
A
Location Item to
Check/Service
Procedure
Not fully Mission
Capable if:
1
Altimeter
barometric
adjustment knob
Check that altimeter
barometric adjustment is set
to 29.92 in Hg.
Altimeter is set to
incorrect barometric
pressure.
2
Altimeter chamber
gasket
Check condition of gasket.
Gasket worn or
damaged.
3
Vacuum
pump/compressor
cooling fans
Check that both fans are
spinning. If not, cycle
CLIMB/FALL/COCK switch
until fans begin to spin.
Cooling fans are
not spinning.
ADDITIONAL PMCS
The Model 452 Test Chamber Assembly, while in service, shall be functionally tested at 30-day
intervals (refer to WP 0009 00).
The altimeter shall be tested and calibrated at 120-day intervals (refer to WP 0024 00).
Calibration shall be performed by authorized calibration activity only.
