As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - FLT 108 - ON APPROACH, LANDING GEAR DID NOT EXTEND WHEN DOWN SELECTED. ALTERNATE GEAR EXTENSION SUCCESSFULLY PERFORMED. LANDED LHR WITHOUT INCIDENT. REPLACED LANDING GEAR PROXIMITY SENSOR. SYSTEM GROUND CHECK NORMAL OPERATION. GEAR SELECTOR VALVE CHANGES AS PRECAUTION. (M)