Service difficulty report · Warning Light · Boeing 777222

Difficulty date
November 13, 2005
Submitted
November 23, 2005
Operation
Air carrier
Aircraft
N799UA
Make and model
Boeing 777222
Aircraft serial
26926
Aircraft time
33,355 hours, 5,136 cycles
Engine
Pwa PW4090
Part
Warning Light
Condition
Illuminated
Location
Adc
Stage of operation
CR
How discovered
O
Nature of condition
N
Precautionary procedure
A

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

What was found

FLIGHT DIVERTED UNDER AMBER ALERT DUE TO MULTIPLE AIR DATA SYSTEM PROBLEMS, OVERWEIGHT LANDING. FOUND DAMAGED QUICK DISCONNECT FOR RIGHT AIR DATA MODULE (ADM) CAUSING INVALID SIGNAL. THE QUICK DISCONNECT WAS REPLACED. THERE WERE 3 ADMS BEING REPLACED AND 2 ADMS WERE FOUND WITH DEFECTIVE A2 TRANSDUCER CARD. THE FINAL FIX WAS REPLACEMENT OF THE LEFT PITOT PROBE. ALL DATA REGARDING THIS OCCURRENCE HAS BEEN SENT TO BOEING FOR FURTHER ANALYSIS. THE FINAL ANALYSIS FROM BOEING WILL BE AVAILABLE ON OR AFTER 2/28/2006, REFERENCE SERVICE REQUEST ID 1-142280425. ALL FINDINGS ARE FROM AMIS AND CIDER. ADMS REMOVED - MR34213-55, -54, -53: PITOT PROBE REMOVED - NO DATA