Service difficulty report · Control Unit · Boeing 757222

Difficulty date
August 8, 2011
Submitted
August 11, 2011
Operation
Air carrier
Aircraft
N551UA
Make and model
Boeing 757222
Aircraft serial
25399
Aircraft time
75,085 hours, 21,736 cycles
Engine
Pwa PW2037
Part
Control Unit
Part number
285T0012201
Part serial
D05093
Condition
Faulty
Location
Spoiler System
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

WHILE TROUBLESHOOTING LOG 1 SPOILER MESSAGE, FOUND 2R SPOILER CONTROL MODULE WITH PCA FAULT BALL. PER FIM AND MM 27-61-99-101, NR 3 AND NR 10 SPOILER PAIR PCA'S NEED TO BE REPLACED, NEEDS TWO PCA'S 643-9104. CONFERRED WITH OPBLM. THE 3 AND 10 SPOILERS LOCKED IN DOWN POSITION. AC IN CAT I, RETURN TO CAT III AFTER REPLACEMENT. WITH THE NEW -200 SCM INSTALLED PLEASE IDENTIFY WHICH PCA IS AT FAULT AND REPLACE ONLY FAULTY PCA. ALSO CHECK RVDTS FOR CORRECT SETTINGS PRIOR TO REPLACING A PCA. FOUND RVDT NR 3 -8.257 NR 10 -8.171. LIMIT -8.013 +- .050. ADJ 3 TO -8.011 10 TO -8.012. ADJ SOLID NO FLUX WHEN ADJ CONNECTOR HOOKED UP. FOUND 2R SCM -200 IN ANOTHER LANGUAGE. NEED TO REPLACE AND ACP OPS CHECK. REPLACED 2R SCM, GND CHECK OK PER MM. NO MSG'S AND NO FAULT BALLS. RETURNED AC BACK TO CAT III STATUS, GND CHECK OK PER AMM.