FTW84IA400

NTSB incident investigation · McDonnell Douglas DC-10-10 · Dfw Airport, TX · September 15, 1984

Incident · No injuriesIncident investigationFinal report
Date
September 15, 1984, 13:05 local (18:05 UTC)
Place
Dfw Airport, TX
Injuries
3 uninjured
Damage
Minor damage
Phase of flight
Enroute
Aircraft
N124AAMcDonnell Douglas DC-10-10
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Case key
21165

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.

On this page

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Airframe/component/system failure/malfunctionDescent
Flight control,slat attachment - improperCause
Maintenance,installation - improperCompany maintenance personnelCause
Flight control,slat attachment - failure,totalCause
Flight control,slat - separation

Analysis

The acft experienced sepn of the rgt wing #3 leading edge slat while descending for an apch. An investigation revealed that on 7/5/84, the company performed a 'c' check inspection of the acft. At this time a rgt wing #3 leading edge slat retract aluminum pulley, p/n 1969-132, was replaced with a phenolic pulley, p/n 1969-172. The DC-10 parts illustrated catalogue specifies that an aluminum pulley be installed on the #3 leading edge slat rather than the phenolic pulley because flt loads on the #3 slat exceeded the design load of the phenolic pulley. Metallurgical examination of the failed pulley & cable indicated evidence of an overload failure. Inspection of other company DC-10'S revealed at least 3 other acft had phenolic pulleys installed in the #3 slat position.

Aircraft

Registration
N124AA
Reported as
McDonnell Douglas DC-10-10
Category
Airplane
Serial number
46524
Airframe hours
34,557
Engine
GE CF6, turbo fan
Damage
Minor damage
Flight
Ferry · Part 91
Registered owner
American Airlines Inc.
Airworthiness certificate
Standard, Transport
Last inspection
AAIP · September 15, 1984 · 1 hours before
Departed
TUL · Tulsa, OK
Flight plan
VFR
Airport
DRW · Dfw Regional

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
46
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Unknown, Unknown
Seat
Left
Flight hours
16,000 total · 14,500 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
40° at 12 knots
Visibility
12 statute miles
Altimeter
30.00 inHg
Observed at
DFW