Service difficulty report · Acm · Boeing 737990ER

Difficulty date
September 23, 2023
Submitted
September 26, 2023
Operation
Air carrier
Aircraft
N409AS
Make and model
Boeing 737990ER
Aircraft serial
41733
Aircraft time
38,572 hours, 12,280 cycles
Part
Acm
Part number
22064002
Part serial
9794
Condition
Faulty
Location
Right
Part time
38,572 hours, 12,280 cycles
Stage of operation
IN
How discovered
V
Nature of condition
J
Precautionary procedure
K

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

What was found

FMC L&R DISCRETES SHOW RIGHT PACK ON EVEN WHEN SWITCHED OFF. GROUNDED - YES. REMOVED R/H PACK FLOW CONTROL VALVE, REMOVED R/H ACM REF AMM 21-51-04. REPLACED R/H PACK FLOW CONTROL VALVE PER AMM 21-51-01-400-802-002 PARA 5H-G(13). DOWN TO OPS CHECKS, INSTALLED NEW ACM REF AMM 21-51-04-400-802-002 PARA 3A-H, DOWN TO OPS TESTS D ISLES13124 09/23/2023. COMPLETED R/H PACK FLOW CONTROL VALVE INSTALLATION REF AMM 21-51-01-400-802-002 PAR 55(14,15) H,I. LEAK AND OPS CHECK GOOD. COMPLETED ACM INSTALLATION REF AMM 21-51-04-400-802-002 STEPS I,J. OPS AND LEAK CHECK GOOD. NO FURTHER FMC L&R DISCRETE FAULTS NOTED.