SDR AALA202407302917

Service difficulty report · Switchpack · Boeing 737823

Difficulty date: July 26, 2024
Submitted: July 30, 2024
Operation: Air carrier
Aircraft: N851NN
Make and model: Boeing 737823
Aircraft serial: 29556
Aircraft time: 41,016 hours, 17,443 cycles
System (JASC): 2230 · Auto Throttle System
Part: Switchpack
Condition: Failed
Location: Autothrottle Sys
Part time: 2,638 hours, 1,269 cycles
Stage of operation: DE
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

AIRCRAFT WAS GROUNDED: DESCENDING THROUGH APPROXIMATELY 14,000 FT AND ABOUT 260 KNOTS, GEAR WARNING HORN SOUNDED FOR SEVERAL SECONDS AND ALL 3 GEAR LIGHTS STEADY RED FOR SEVERAL SECONDS WITH HANDLE IN THE OFF POSITION. GEAR OPERATED NORMALLY ON THE APPROACH. BITE CHECK AND CLEANING OF LRRA ANTENNA'S GOOD, BITE CHECK OF PSEU SHOWS NO FAULTS PER 32-09-10. LEFT HAND ENGINE SWITCHPACK FAILED DURING AMM 31-51-00 TEST. REMOVE AND REPLACED LEFT HAND SWITCHPACK, PER J/C 08L11276001. OPERTIONAL AND LEAK CHECK GOOD.