SDR FDEA202101220179

Service difficulty report · Probe · Doug MD11F

Difficulty date: January 22, 2021
Submitted: January 26, 2021
Operation: Air carrier
Aircraft: N623FE
Make and model: Doug MD11F
Aircraft serial: 48794
Aircraft time: 62,095 hours, 15,936 cycles
System (JASC): 3416 · Altimeter, Barometric/Encoder
Part: Probe
Condition: Failed
Location: Tat
Stage of operation: CL
How discovered: O
Nature of condition: G
Precautionary procedure: A

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

What was found

PASSING FL270, ALL DATA DROPPED OFF PFD (AUTOPILOTS, AUTOTHOTTLES, NAV DATA, FLIGHT DIRECTOR ETC), RAN QRH TO STABILIZE AIRPLANE, PER QRH SWITCHED CADC 1 TO AUX & DATA RETURNED. AIR TURNBACK TO ONT, HAD IDENTICAL FAILURE USING AUX. DATA RETURNED ON ITS OWN A MINUTE LATER. EMERGENCY DECLARED. REMOVED AND REPLACED TAT SENSOR PER AMM 34-16-02-2. OPS CHECK NORMAL. AC OK TO CONTINUE

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