SDR FDEA201211234136

Service difficulty report · Dadc · Doug MD11F

Difficulty date: November 23, 2012
Submitted: December 18, 2012
Operation: Air carrier
Aircraft: N625FE
Make and model: Doug MD11F
Aircraft serial: 48753
Aircraft time: 62,322 hours, 11,081 cycles
System (JASC): 2200 · Auto Flight System
Part: Dadc
Part number: 91010302
Part serial: 92030447
Condition: Failed
Stage of operation: TO
How discovered: O
Nature of condition: P
Precautionary procedure: O

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

What was found

FIRST OFFICER LOST AIRSPEED INFORMATION DURING TAKEOFF ROLL, SUSPECT DADC FAILURE. AT 300FT AGL, CAPTAIN LOST FLT DIRECTOR CONTROL OF FCP ALT-SELECTOR AIRSPEED SEEMED OK. WHEN F/O SWITCH TO CAPTAIN'S ADC, CAPTAIN'S SIDE GOT FLT DIRECT, AUTO PILOT, AUTO THROTTLES BACK. CAPTAIN'S SIDE AIRSPEED WAS GOOD BUT LOW SPEED FOOT WAS APPROX 10-12 KTS.

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