SDR DHL2001801007

Service difficulty report · Control Unit · Doug DC873F

Difficulty date: June 22, 2001
Submitted: October 19, 2001
Operation: Air carrier
Aircraft: N801DH
Make and model: Doug DC873F
Aircraft serial: 46033
System (JASC): 2130 · Cabin Pressure Control System
Part: Control Unit
Condition: Malfunctioned
Location: Cabin Pressure
Stage of operation: CR
How discovered: O
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AT CRUISE ALT IN BOTH MANUAL AND AUTO PRESSURIZATION AND AT ALL FLOW SETTINGS, CABIN CLIMBS AND DESCENDS UP TO 700 FPM AND WILL NOT STABILIZE AT CONSTANT PRESSURE. INSP OUTFLOW VALVE OPERATION, NO DEFECTS NOTED. PRESSURIZED A/C TO 7 PSI ON GROUND, DECAY CHECKED GOOD. AUTO AND MANUAL PRESSURIZATION CHECK GOOD PER MM 21-30-0.

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