Service difficulty report · Computer · Boeing 737824

Difficulty date
May 18, 2024
Submitted
May 21, 2024
Operation
Air carrier
Aircraft
N34222
Make and model
Boeing 737824
Aircraft serial
28931
Aircraft time
77,866 hours, 28,599 cycles
Part
Computer
Part number
285A1010106
Part serial
D01421
Condition
Malfunctioned
Location
Stall Management
Part time
72,086 hours, 26,649 cycles
Stage of operation
CL
How discovered
O
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

ON TAKEOFF AUTOTHROTTLE WOULD NOT ARM. DISCONNECTED AFTER LIFT OFF. WOULD NOT REARM. DFCS BITE CURRENT STATUS AUTO TEST PERFORMED AOA SENSOR TEST. SENSORS TESTS (AOA&SMYD) WITHIN TOLERANCE REF AMM 34-21-05-730-801 PERFORMED CONTINUITY CHECKS BETWEEN SMYD2 AND A/T COMPUTER. CHECK GOOD. NEED CONTINUITY CHECK BETWEEN SMYD2 AND FCC B. IF CHECKS GOOD. REPLACE SMYD2 REF L/P 8003377, ACP FIM 22-31 TASK 801 NO EXISTING FAULTS ON AUTOTHROTTLE SYSTEM. GRD TEST OK.CONTINUITY CHECKED BETWEEN SMYD2 AND FCC B. NO FAULTS NOTED. SMYD 2 REPLACED AS PRECAUTIONARY. DFCS BITE ACP BITE OF BOTH SMYDS PER 27-32-00-740-803, BOTH UNITS DID NOT HAVE A FAULT.CHECKED GOOD WORKED FIM 22-15 TASK 801, NO FAULTS FOUND ON SMYDS 1 OR 2. UP TO STEP E, SMYDS WERE NO SWAPPED DUE TO NO FAULTS. TECH DID BITE LIBRARY TEST , NO FAULTS FOUND. CHECKED FSEU BITE AND FOUND NO CURRENT FAULTS. COMPUTER, STALL OFF 29-2732-9-0003 1421 ON 29-2732-9-0003 0484 COMPUTER, STALL OFF 29-2732-9-0003 1421 ON 0000 REF L/P 8003355, REMOVED FCC B AND SMYD 2. ACP CONTINUITY CHECK BETWEEN SMYD2 AND FCC B. CHKS OK.REINSTALLED FCC B AND REPLACED SMYD 2 AS PRECAUTIONARY, NO EXISTING FAULTS NOTED. REF AMM 27-32-42-400-801 AND 22-11-33-400-801. LAND VERIFY NEEDS TO BE ACP.