Service difficulty report · Circuit Breaker · Boeing 737990ER

Difficulty date
December 21, 2016
Submitted
December 23, 2016
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
8,835 hours, 2,913 cycles
Part
Circuit Breaker
Condition
Tripped
Location
Lt A/C Pack
Stage of operation
TX
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

RAM AIR MOD CONT LEFT CIRCUIT BREAKER TRIPPED. ACFT GROUNDED. INSPECTED & RESET THE RAM AIR MOD CONT LEFT CIRCUIT BREAKER IAW AMM 20-60-01 PERFORMED LT PACK-ZONE TEMP CONT BITE TEST, NO DEFECTS NOTED IAW AMM 21-61-00. VERIFIED FULL RANGE OF MOTION ON FWD & AFT RAM AIR DOORS AS WELL AS ON THE RT PACK ZONE TEMP CONT. NO FAULTS NOTED. RAN LT PACK WITH NO DEFICIENCIES NOTED. NO HISTORY 60 DAYS OPS CHECKED OK.