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NTSB Report
August 10, 1989 · Boeing 727-254 · N915TS
Boston, MA
Overview
Report Status
Probable Cause
Event Type
Incident
Date
August 10, 1989
Injury Outcomes
2 injuries (2 minor injuries), 54 uninjured
Location
Boston, MA
Aircraft
Boeing 727-254
Tail Number
N915TS
Injuries
Minor
Aircraft Damage
Minor
NTSB Number
NYC89IA185
THE CREW OF A BOEING 727 WAS UNABLE TO LOWER THE NOSE LANDING GEAR BY EITHER NORMAL MEANS OR BY USE OF THE MANUAL HANDCRANK. A NOSE GEAR UP LANDING WITH AN EMERGENCY EVACUATION THROUGH THE L1/R1 EXITS WAS MADE. POST INCIDENT INVESTIGATION SHOWED THAT BOTH LINKS WHICH REMOVE THE LOCKING PAWLS IN THE NOSE GEAR DRAG BRACE WERE FRACTURED. WHEN EXAMINED AT BOEING METALLURGICAL LABORATORY, NO EVIDENCE WAS FOUND THAT BUSHINGS WERE INSTALLED.
NTSB Probable Cause
THE FAILURE OF THE LANDING GEAR DRAG BRACE TO UNLOCK DURING LANDING. CONTRIBUTING WAS THE FAILURE OF PACIFIC SOUTHWEST AIRLINES TO CATCH THE INCORRECT ASSEMBLY. AN ADDITIONAL FACTOR WAS THE USE OF FAULTY INFORMATION BY EASTERN AIRLINES AND THEIR DECISION TO NOT MAKE THE INSPECTION REQUIRED BY THE BOEING SERVICE LETTER.
Full Narrative
THE CREW OF A BOEING 727 WAS UNABLE TO LOWER THE NOSE LANDING GEAR BY EITHER NORMAL MEANS OR BY USE OF THE MANUAL HANDCRANK. A NOSE GEAR UP LANDING WITH AN EMERGENCY EVACUATION THROUGH THE L1/R1 EXITS WAS MADE. POST INCIDENT INVESTIGATION SHOWED THAT BOTH LINKS WHICH REMOVE THE LOCKING PAWLS IN THE NOSE GEAR DRAG BRACE WERE FRACTURED. WHEN EXAMINED AT BOEING METALLURGICAL LABORATORY, NO EVIDENCE WAS FOUND THAT BUSHINGS WERE INSTALLED.
Flight
Event TypeIncident
Event Time10:46 EDT
Nearest AirportLogan Intl (0nm N)
Runway33L
Runway Length10081 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 727-254
Tail NumberN915TS
Aircraft CategoryAir
DamageMinor
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsP&W · JT8D-7B · Turbofan · 14000
Seats165
People & Injuries
Injury Summary2 injuries (2 minor injuries), 54 uninjured
Fatal0
Serious0
Minor2
Uninjured54
Total56
Crew 1Age 47 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind150° @ 8 kt
Visibility9 sm
CeilingNone
Temperature / Dew Point57
Altimeter30.00 inHg
Observation Time18:50
Weather SourceWFAC