Service difficulty report · Adc · Boeing 74747UF

Difficulty date
April 22, 2024
Submitted
April 24, 2024
Operation
Air carrier
Aircraft
N412MC
Make and model
Boeing 74747UF
Aircraft serial
30559
Aircraft time
96,477 hours, 15,633 cycles
Part
Adc
Part number
4040800911
Part serial
97044963
Condition
Faulted
Location
Right
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
J, A

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

What was found

DURING FLIGHT BUFFET MARGIN AND STALL SPEED MARGIN DISPLAYS WERE DIFFERENT BY +/- 20KIAS FROM LEFT AND RIGHT DISPLAYS(<P>DFDR DATA DOWNLOADED & SENT TO HDQ PER AMM 31-31-01 REV 110. AOA SENSOR TEST OK (NO LIGHT) PER AMM 34-12-03 REV 110. AS PER REQUEST, R/R RH AOA SENSOR PER 34-12-03 REV 110. R/R LH AOA SENSOR PER AMM 34-12-03 REV 110. ACCOMPLISHED BOEING RECOMMENDED YLS-TLS 24--0392-02B, 1/03B & -05B. ACCOMPLISHED R/R LH & RH ADC & OPS CHECK NORMAL PER AMM 34-12-01 REV 110. R/R JETT NOZZLE VALVE & ACTUATOR PER AMM 28-31-03 & 28-31-04 ERV 110. LEAK TEST OK PER AMM 28-31-03 REV 110. ACCOMPLISHED TLS-24-0392-09B. NOTIFIED MCC & OK TO CLOSE. RETURN TO SERVICE.</P>)

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