SDR AU970697

Service difficulty report · Adc · Boeing 727277

Difficulty date
February 19, 1997
Submitted
March 26, 2000
Operation
General aviation
Make and model
Boeing 727277
Engine
Pwa JT8D15
Part
Adc
Part number
HG480B13
Condition
Faulty
Location
Air Data Comp
Stage of operation
CL
Nature of condition
F
Precautionary procedure
K

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

What was found

(AUS) NO1 AIR DATA COMPUTER FAILED. WORKSHOP INSPECTION FOUND THAT THE PITOT AND STATIC TRANSDUCERS FAILED THE CALIBRATION TEST BUT WERE NOT CONSIDERED TO BE THE CAUSE OF THE FAILURE. FURTHER INVESTIGATION FOUND A DRY SOLDER JOINT ON ONE OF THE DC POWER SUPPLY CONNECTING PINS AND DETERIORATED HEAT SINK COMPOUND FORTHE DIODES.