Service difficulty report · Switchpack · Boeing 737990ER

Difficulty date
June 14, 2016
Submitted
June 16, 2016
Operation
Air carrier
Aircraft
N419AS
Make and model
Boeing 737990ER
Aircraft serial
41734
Aircraft time
12,954 hours, 4,217 cycles
Engine
Cfmint CFM567B27E
Part
Switchpack
Part number
254A115013
Condition
Failed
Location
Autothrottle Sys
Stage of operation
TX
How discovered
O
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

PSEU ILLUMINATED ROLLOUT, EXTINGUISHED ON TAXI. ACFT GROUNDED. BITE OF PSEU HAS NO CURRENT FAULTS. FLIGHT HISTORY IS SHOWING NUMEROUS FLIGHTS WITH MESSAGE 32-62101, LT THRUST LEVER RESOLVER ANGLE IS NOT LESS THAN 44 WHILE LANDING. REF TASKS AMM 32-09-00-810-816 AND 32-09-00-810-821. REF FIM 32-09, TASK 816, D10982, PIN 40 READS NORMALLY. REF WDM 32-64-21, VERIFIED GOOD GROUND AT D11128, PIN 2, AND GOOD SWITCH ACTUATION. UNABLE TO DUPLICATE, DUE TO FREQUENCY OF FAULT 32-62101, NEARLY EVERY FLIGHT LEG, REQUIRES REPLACEMENT OF M1766, LT AUTOTHROTTLE SWITCHPACK. REMOVED M1766, REF AMM 76-11-07. REPLACED & ADJUSTED M1766, REF AMM 76-11-07. AUTOTHROTTLE SWITCHPACK ASSY M1766. GROUND VERIFICATION SUCCESSFUL, REF AMM 27-62-00, 32-09-10, 32-42-00, 78-31-00, 30-11-00, 31-51-00 & 34-43-00.