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NTSB Report
February 9, 1992 · Boeing 727-214A · N752US
San Juan, PR
Overview
Report Status
Probable Cause
Event Type
Incident
Date
February 9, 1992
Injury Outcomes
No injuries (157 uninjured)
Location
San Juan, PR
Aircraft
Boeing 727-214A
Tail Number
N752US
Operator
Usair
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA92IA081
FLT lost 'A' hydraulic system when left main gear door up line ruptured during gear retraction at point it had chaffed on APU. Capt called for 30,000 pounds of fuel to be dumped followed by manual extension of the landing gear. FLT Eng could not get RT main gear to extend manually. Capt told FLT Eng to view position of main landing gear through view ports in cabin. FLT Eng could not locate the view ports and returned to cockpit. Capt then ordered fuel dumped to minimum level after which a landing with RT main gear retracted was made. After landing when aircraft was raised the RT main landing gear was found to be stowed on the uplock normally. The gear was then extended following normal manual extension procedures. No evidence of malfunction of the RT main gear was found. The RT main gear extends by cranking opposite direction from the left and nose gear. The FLT Eng became qualified as FLT Eng on 11/03/91 and had accumulated 200 hours as FLT Eng.
NTSB Probable Cause
THE FLIGHT ENGINEER'S LACK OF TRAINING IN EMERGENCY PROCEDURES AND HIS FAILURE TO FOLLOW PUBLISHED EMERGENCY PROCEDURES, RESULTING IN HIS NOT BEING ABLE TO MANUALLY EXTEND THE RIGHT MAIN LANDING GEAR, FOLLOWING THE LOSS OF THE 'A' HYDRAULIC SYSTEM. CONTRIBUTING TO THE INCIDENT WAS THE CAPTAINS FAILURE TO EXHAUST ALL AVAILABLE RESOURCES AND TIME IN ATTEMPTS TO EXTEND THE RIGHT MAIN LANDING GEAR PRIOR TO LANDING WITH THE GEAR RETRACTED.
Full Narrative
FLT LOST 'A' HYDRAULIC SYSTEM WHEN LEFT MAIN GEAR DOOR UP LINE RUPTURED DURING GEAR RETRACTION AT POINT IT HAD CHAFFED ON APU. CAPT CALLED FOR 30,000 POUNDS OF FUEL TO BE DUMPED FOLLOWED BY MANUAL EXTENSION OF THE LANDING GEAR. FLT ENG COULD NOT GET RT MAIN GEAR TO EXTEND MANUALLY. CAPT TOLD FLT ENG TO VIEW POSITION OF MAIN LANDING GEAR THROUGH VIEW PORTS IN CABIN. FLT ENG COULD NOT LOCATE THE VIEW PORTS AND RETURNED TO COCKPIT. CAPT THEN ORDERED FUEL DUMPED TO MINIMUM LEVEL AFTER WHICH A LANDING WITH RT MAIN GEAR RETRACTED WAS MADE. AFTER LANDING WHEN AIRCRAFT WAS RAISED THE RT MAIN LANDING GEAR WAS FOUND TO BE STOWED ON THE UPLOCK NORMALLY. THE GEAR WAS THEN EXTENDED FOLLOWING NORMAL MANUAL EXTENSION PROCEDURES. NO EVIDENCE OF MALFUNCTION OF THE RT MAIN GEAR WAS FOUND. THE RT MAIN GEAR EXTENDS BY CRANKING OPPOSITE DIRECTION FROM THE LEFT AND NOSE GEAR. THE FLT ENG BECAME QUALIFIED AS FLT ENG ON 11/03/91 AND HAD ACCUMULATED 200 HOURS AS FLT ENG.
Flight
Event TypeIncident
Event Time17:10 AST
Nearest AirportLuis Munoz Marin Int'L (0nm N)
Runway8
Runway Length10002 ft
Runway Width200 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 727-214A
Tail NumberN752US
Aircraft CategoryAir
DamageMinor
OperatorUsair
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsP&W · JT8D-15A · Turbofan · 15500
Seats157
People & Injuries
Injury SummaryNo injuries (157 uninjured)
Fatal0
Serious0
Minor0
Uninjured157
Total157
Crew 1Age 54 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind70° @ 12 kt
Visibility15 sm
CeilingBroken clouds 7000 ft
Altimeter30.00 inHg
Observation Time20:53
Weather SourceWFAC