SDR P5CA9700511

Service difficulty report · Cadc · Boeing 747122

Difficulty date: April 30, 1997
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N850FT
Make and model: Boeing 747122
Aircraft serial: 19755
System (JASC): 3417 · Air Data Computer
Part: Cadc
Part number: 1903951
Condition: Malfunctioned
Location: E/E Compt
Stage of operation: CR
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

NUMBER 1 AND NUMBER 3 INS TAS AND WIND DIRECTION BLANK AND/OR FLASHING MANY DIFFERENT TRUE AIR SPEEDS AND WIND DIRECTION AND SPEEDS. NUMBER 1 INS WOULD NOT NAVIGATE CORRECTLY. NUMBER 2 INS ERROR RATE 5 MILES PER HOUR. REPLACED NR 1 CADC PER MAINTENANCE MANUAL 34-12-01 BITE TEST/FUNCTIONAL CHECKED PER 34-12-00. REPLACED NUMBER 2 INU PER MAINTENANCE MANUAL 34-41-03, OPERATIONAL CHECK PER 34-41-00.