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NTSB Report
April 23, 1992 · Lockheed L-1011-385 · N721DA
Flushing, NY
Overview
Report Status
Probable Cause
Event Type
Incident
Date
April 23, 1992
Injury Outcomes
No injuries (308 uninjured)
Location
Flushing, NY
Aircraft
Lockheed L-1011-385
Tail Number
N721DA
Operator
Delta Airlines
Injuries
None
Aircraft Damage
Minor
NTSB Number
NYC92IA086
WITNESSES STATED THAT THE AIRPLANE LANDED HARD AND THAT THE TIRES 'BLEW' WHEN THE NOSEWHEEL TOUCHED DOWN. THE 'NORMAL SINK RATE' FOR THE NOSE WHEEL IS APPROXIMATELY 1 FOOT PER SECOND. THE CALCULATED RATE OF SINK FOR FLIGHT 702 WAS 14.66 FEET PER SECOND. POST INCIDENT EXAMINATION OF THE TIRES REVEALED THE FAILURE WAS NOT BECAUSE OF HEAT FROM AN OVER OR UNDER INFLATION CONDITION. IT WAS CONCLUDED BY THE TIRE MANUFACTURER THAT THE TIRE FAILURE WAS 'MOST LIKELY' THE RESULT OF THE EXCESSIVE FORCES APPLIED DURING THE NOSEWHEEL TOUCHDOWN.
NTSB Probable Cause
THE CAPTAIN'S IMPROPER AIRCRAFT CONTROL WHICH RESULTED IN AN EXCESSIVE NOSEWHEEL RATE OF SINK AND SUBSEQUENT OVERLOAD FAILURE OF THE NOSE GEAR TIRES.
Full Narrative
WITNESSES STATED THAT THE AIRPLANE LANDED HARD AND THAT THE TIRES 'BLEW' WHEN THE NOSEWHEEL TOUCHED DOWN. THE 'NORMAL SINK RATE' FOR THE NOSE WHEEL IS APPROXIMATELY 1 FOOT PER SECOND. THE CALCULATED RATE OF SINK FOR FLIGHT 702 WAS 14.66 FEET PER SECOND. POST INCIDENT EXAMINATION OF THE TIRES REVEALED THE FAILURE WAS NOT BECAUSE OF HEAT FROM AN OVER OR UNDER INFLATION CONDITION. IT WAS CONCLUDED BY THE TIRE MANUFACTURER THAT THE TIRE FAILURE WAS 'MOST LIKELY' THE RESULT OF THE EXCESSIVE FORCES APPLIED DURING THE NOSEWHEEL TOUCHDOWN.
Flight
Event TypeIncident
Event Time14:43 EDT
Nearest AirportLaguardia International (0nm)
Runway4
Runway Length7000 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftLockheed L-1011-385
Tail NumberN721DA
Aircraft CategoryAir
DamageMinor
OperatorDelta Airlines
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsRolls-Royce · RB211-524 · Turbofan · 50000
People & Injuries
Injury SummaryNo injuries (308 uninjured)
Fatal0
Serious0
Minor0
Uninjured308
Total308
Crew 1Age 55 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind340° @ 15 kt, gusting 20 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter30.00 inHg
Weather SourceWIT