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NTSB Report
January 26, 1993 · Fokker F-28 MK 1000 F.28 MK 10 · N452US
Detroit, MI
Overview
Report Status
Probable Cause
Event Type
Incident
Date
January 26, 1993
Injury Outcomes
No injuries (42 uninjured)
Location
Detroit, MI
Aircraft
Fokker F-28 MK 1000 F.28 MK 10
Tail Number
N452US
Operator
Usair
Injuries
None
NTSB Number
CHI93IA078
THE CAPTAIN OBTAINED NO RESPONSE TO NOSE-UP STABILIZER TRIM DURING DESCENT. NORMAL NOSE-DOWN TRIM REMAINED OPERABLE; ALTERNATE TRIM WAS NOT ATTEMPTED. THE CREW REPORTED A JAMMED STABILIZER AND LANDED WITH NOSE-DOWN TRIM. DISASSEMBLY OF THE HORIZONTAL STABILIZER CONTROL UNIT SHOWED INADEQUATE LUBRICANT AND EXTENSIVE CORROSION IN A GEARBOX. THE AIRFRAME MANUFACTURER'S PROCEDURE FOR REPLENISHING THE GEARBOX LUBRICANT COULD RESULT IN UNDERSERVICING. THE OPERATOR OBSERVED A GEARBOX SERVICE INTERVAL WHICH WAS 250% OF THE MANUFACTURER'S RECOMMENDATION.
NTSB Probable Cause
IMPROPER LUBRICATION OF THE HORIZONTAL STABILIZER GEARBOX BY COMPANY MAINTENANCE PERSONNEL. A FACTOR WAS THE MANUFACTURER'S INADEQUATE SERVICE PROCEDURE.
Full Narrative
THE CAPTAIN OBTAINED NO RESPONSE TO NOSE-UP STABILIZER TRIM DURING DESCENT. NORMAL NOSE-DOWN TRIM REMAINED OPERABLE; ALTERNATE TRIM WAS NOT ATTEMPTED. THE CREW REPORTED A JAMMED STABILIZER AND LANDED WITH NOSE-DOWN TRIM. DISASSEMBLY OF THE HORIZONTAL STABILIZER CONTROL UNIT SHOWED INADEQUATE LUBRICANT AND EXTENSIVE CORROSION IN A GEARBOX. THE AIRFRAME MANUFACTURER'S PROCEDURE FOR REPLENISHING THE GEARBOX LUBRICANT COULD RESULT IN UNDERSERVICING. THE OPERATOR OBSERVED A GEARBOX SERVICE INTERVAL WHICH WAS 250% OF THE MANUFACTURER'S RECOMMENDATION.
Flight
Event TypeIncident
Event Time09:52 EST
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftFokker F-28 MK 1000 F.28 MK 10
Tail NumberN452US
Aircraft CategoryAir
OperatorUsair
Operating RulePart 121
Engines2
Engine TypeTurbojet
Engine DetailsRolls-Royce · SPEY 555-15 · Turbojet · 9850
Seats65
People & Injuries
Injury SummaryNo injuries (42 uninjured)
Fatal0
Serious0
Minor0
Uninjured42
Total42
Crew 1Age 50 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 14 kt
Visibility20 sm
CeilingBroken clouds 2000 ft
Temperature / Dew Point25 C / 18 C
Altimeter30.00 inHg
Observation Time14:50
Weather SourceWFAC