SDR UIEA2020100902202

Service difficulty report · Controller · Boeing 76733A

Difficulty date: October 9, 2020
Submitted: October 13, 2020
Operation: Air carrier
Aircraft: N1997A
Make and model: Boeing 76733A
Aircraft serial: 27310
Aircraft time: 98,906 hours, 20,433 cycles
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Condition: Malfunctioned
Location: Cabin Pressure
Stage of operation: CR
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

IN CRUISE, A/C PRESSURIZATION REPEATEDLY CYCLED TO A DESCENT THEN CLIMB BEFORE STABILIZING. NOTED ON GAUGES AND PRESSURE ON PILOT EARS. PERFORMED CONTROLLER BITE CHECK, NO FAULTS AND A/C PRESSURIZATION TO 4 PSI, IAW AMM 21-31-01. NO DEFECTS NOTED.

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