SDR AALA201902059005

Service difficulty report · Knob · Airbus A321231

Difficulty date: February 3, 2019
Submitted: April 3, 2019
Operation: Air carrier
Aircraft: N538UW
Make and model: Airbus A321231
Aircraft serial: 4050
Aircraft time: 30,887 hours, 12,044 cycles
System (JASC): 3416 · Altimeter, Barometric/Encoder
Part: Knob
Condition: Sheared
Location: Selector
Part time: 51,937 hours, 24,024 cycles
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: A

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

What was found

ALTIMETER ISSUE, EMERGENCY DECLARED, FLIGHT RETURNED TO DEPARTURE AND LANDED WITHOUT FURTHER INCIDENT. ON ARRIVAL, FOUND THE SELECTOR KNOB HAD SHEARED AND HAD COME LOOSE. THE AIRCRAFT WAS GROUNDED. REPLACED FCU IAW AMM 22-81-12. PERFORMED SATISFACTORY AFS TEST & LAND CAT 3 CAPABILITY TEST IAW AMM 22-96-00 & AMM 22-97-00.

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