Service difficulty report · Control Unit · Boeing 747200

Difficulty date
September 3, 2006
Submitted
September 6, 2006
Operation
Air carrier
Aircraft
N505MC
Make and model
Boeing 747200
Aircraft serial
21251
Aircraft time
93,312 hours, 20,408 cycles
Engine
Ge CF650E2
Part
Control Unit
Part number
65B477505
Part serial
000065
Condition
Malfunctioned
Location
Anti Skid Sys
Part time
2,019 hours, 440 cycles
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

(DIV) AFTER T/O GROUND SAFETY RELAY LIGHT REMAINED ON ALONG WITH G/S 1 ANT LIGHT, PROBE HEAT LIGHT AND ALL 4 ALTERNATE NOT TILTED LIGHTS WERE ILLUMINATED. NR 1 ENG OVER SPEED ON N2 110.2 FOR 15 SEC AT CRUISE ALL OTHER ENG INDICATIONS NORMAL. NR 3 ENG N1 OVER SPEED LIMIT 119.1 FOR 8 SEC AT CRUISE ALL OTHER ENG INDICATIONS NORMAL. NR 4 ENG OVER SPEED N1 AT 119.8 FOR 19 SECONDS, ALL OTHER ENG INDICATIONS NORMAL. AT TOUCHDOWN AUTO BRAKES KICKED OFF ON THERE OWN. RIGHT WING AND BODY GEAR BRAKE TEMPS CLIMBED TO 8.0 ON THE BRAKE TEMP GAUGE THE LEFT BODY AND WING GEAR TEMPS REMAINED AT LOW GREEN PRIOR TO BLOCK ALL ANTI SKID LIGHTS ILLUMINATED. REMOVED AND REPLACED LANDING GEAR LOGIC MODULE AS PER MM 32-61-14, OPS

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