Service difficulty report · Autoland Sys · Boeing 737890

Difficulty date
September 21, 2017
Submitted
September 25, 2017
Operation
Air carrier
Aircraft
N506AS
Make and model
Boeing 737890
Aircraft serial
35690
Aircraft time
35,274 hours, 10,808 cycles
Part
Autoland Sys
Condition
Malfunctioned
Stage of operation
LD
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

DURING A PRACTICE CAT III HGS, AUTOLAND TO RWY, WIND REPORTED AS CALM AND CRITICAL AREA CONFIRMED CLEAR, AT APPROX 150 FT, THE AIRCRAFT DRIFTED RIGHT OF CENTER LINE AND REMAINED RIGHT OF CENTERLINE UNTIL CROSSING THRESHOLD WHEN AIRCRAFT SLIGHTLY BANKED LEFT TOWARD CENTERLINE. THROTTLES RETARDED TO IDLE AND AIRCRAFT PITCHED OVER TOWARD THE RUNWAY. AIRCRAFT CONTINUED TOWARD CENTERLINE, FLARED AND TOUCHED DOWN SLIGHTLY, LEFT WING LOW ON LEFT MAIN, BOUNCED AND TRACKED THE CENTERLINE ON ROLLOUT. TOUCHDOWN WAS WITHIN ALLOWABLE TOUCHDOWN ZONE LIMITS. HGS GUIDANCE CLOSELY FOLLOWED AUTOPILOT. ACFT GROUNDED. ACCOMPLISHED LLM MAINT TEST FOR INBOUND CONDITION. DFCS BITE PROCEEDURE GROUP 20 & MAINT PRACTICE GRP 49, TEST PASSED IAW AMM 22-00-01-730-807. ACCOMPLISHED INBOUND CONDITION FOR HGS LLM TESTS SYS, TEST PASSED IAW AMM 22-00-01-839-003.