Service difficulty report · Adc · Boeing 747409

Difficulty date
April 14, 2026
Submitted
April 15, 2026
Operation
Air carrier
Aircraft
N249BA
Make and model
Boeing 747409
Aircraft serial
24309
Aircraft time
89,108 hours, 16,929 cycles
Part
Adc
Part number
4040800915
Part serial
01036528
Condition
Faulted
Location
Zone 200
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

CAPTAINS AIRSPEED INDICATION UNRELIABLE. FO INDICATION APPEARED TO BE NORMAL(<P>LH AIR DATA COMPT FAILED. REMOVED & REPLACED REF LOG PAGES #2107407, 2107408,2107409 FOR FURTHER DETAILS</P> / <P>LP 2107408 M3&4: R/R L ADC IAW AMM 34-12-01/401 REV 116. REF IPC 34-12-01 SHEET 1 ITEM 1. GROUND TEST NORMAL, FAULT CLEARED. R/R ADC LT REF AMM 34-12-01 REV 116. INSTALLATION TEST OF THE ADC PASS, NO FAULTS. AIR DATA SYS OPERATIONAL TEST PASS, NO FAULTS, REF AMM 34-12-00/501 REV 116. REF IPC 34-12-01-01-105 REV 10. </P> / <P>LP 2107409 M5: MSG 21167 NUISANCE MSG, REF FIM 21-61 TASK 914 REV 116. NO ACTION REQ, CONTINUE SERVICE.</P>)