Service difficulty report · Autoland Sys · Boeing 737990ER

Difficulty date
November 18, 2017
Submitted
November 20, 2017
Operation
Air carrier
Aircraft
N403AS
Make and model
Boeing 737990ER
Aircraft serial
41730
Aircraft time
20,238 hours, 6,642 cycles
Part
Autoland Sys
Condition
Malfunctioned
Location
Cockpit
Stage of operation
LD
How discovered
O
Nature of condition
F
Precautionary procedure
K

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

What was found

AUTOLAND UNSUCCESSFUL. REQUIRED INTERVENTION BEFORE NOSE WHEEL REACHED THE RUNWAY DUE TO ABNORMALLY HIGH PITCH ANGLE. CRITICAL AREA WAS PROTECTED; TOUCHDOWN OCCURRED IN THE TOUCHDOWN ZONE, BUT NOSE WHEEL CONTINUED TO PITCH UP AFTER MAIN WHEELS TOUCHED. HGS MONITOR FUNCTIONED PROPERLY. GROUNDED - YES. DFCS CURRENT STATUS TEST (BITE GRP 20) SHOWS NO FAULTS. FAULT HISTORY OF CHANNEL A OR B FOR NOV 18 LEGS SHOWED NO FAULTS RELATED TO ELEVATOR OR ILS DURING USE. PERFORMED DFCS LAND VERIFY TEST (BITE GRP 49) PER AMM 22-11-00/201, TEST PASSED. PERFORMED DFCS ELEVATOR SURFACE TEST (BITE GROUP 60.31) PRECAUTIONARY PER AMM 22-11-00, TEST PASSED. NO PREVIOUS HISTORY. THIS CLEARS MEL 22-20B, 22-99B.