FTW95IA053

NTSB incident investigation · Boeing B-737-300 · Houston, TX · November 26, 1994

Incident · No injuriesIncident investigationFinal report
Date
November 26, 1994, 11:02 local (17:02 UTC)
Place
Houston, TX
Injuries
134 uninjured
Damage
Minor damage
Phase of flight
Standing
Aircraft
N14336Boeing B-737-300
Weather
Visual (VMC) · Day
Status
Completed · report June 29, 1995
Report
Approved by Office Director
FAA report
19941126046999I
Case key
19261

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

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Probable cause

The failure of maintenance personnel to follow the taxi checklist resulting in the hydraulic pumps not being turned on.

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.

On ground/water collision with objectStanding - starting engine(s)
Object - aircraft moving on ground
Hydraulic system,pump - not engagedCause
Checklist - not followedCompany maintenance personnelCause

Analysis

Two mechanics were repositioning a Boeing 737-200, N11244, to Continental departure gate 41. The left seat mechanic did not utilize the mechanic taxi checklist. This mechanic subsequently reported difficulty in nose wheel steering and braking. The right seat mechanic offered to call maintenance; however, the other mechanic declined the offer. At the time, flight 1176, a Boeing 737-300, N14336, from gate 44 was under control of the pushback team. The crew of the pushback airplane and witnesses reported the repositioning airplane engines were at 'a very high power setting' and 'taxiing at a high rate of speed.' The right wing of airplane N11244 was substantially damaged when it hit the left outboard flap area of N14336. The hydraulic systems for the nose wheel steering, the main wheel steering, the main wheel brakes, and the thrust reversers were functionally tested and found operational.

Factual narrative

On November 26, 1994, at 1102 central standard time, a Boeing 737-300, N14336, Continental Airlines Flight 1176, received minor damage during a ground collision at the Intercontinental Airport, Houston, Texas. The crew of 6 and 128 passengers were not injured. Visual meteorological conditions prevailed for the scheduled Title 14 CFR Part 121 flight to Chicago, Illinois.

Two mechanics were repositioning a Boeing 737-200, N11244, to Continental departure gate 41. Simultaneously, Flight 1176, a Boeing 737-300, from gate 44 was under the control of the pushback team consisting of a tug driver and a wingwalker. The right wing of N11244 contacted the left outboard flap, cockpit crew, in the process of starting engine #1, felt the impact, aborted the engine start, and looked aft from the cockpit window. The passengers were deplaned out of the right forward door utilizing portable stairs.

During interviews, conducted by the investigator-in-charge and the operator, with the left seat (lead) mechanic, the following information was revealed. The mechanic taxi checklist was not utilized. He was unable to verify by discussion the "ON" position of the cockpit hydraulic pump switches for the Boeing 737-200 versus the 737-300, which are not in the same sequence in the cockpit. He reported difficulty in nose wheel steering and braking with N11244.

During interviews, conducted by the investigator-in-charge and the operator, with the right seat mechanic, the following information was revealed. He offered to call maintenance following an indication by the left seat mechanic of a nose wheel steering problem; however, that mechanic declined the offer.

On the enclosed statements the crew and witnesses stated that the repositioning aircraft engines were at "a very high power setting" and "taxing at a high rate of speed."

The hydraulic systems (enclosed report) for the nose wheel steering, the main wheel steering, the main wheel brakes, and the thrust reversers were functionally tested. It was determined by the test that 5 brake applications were available from the accumulator of the "A" hydraulic system and that 6 brake applications were available from the accumulator of the "B" hydraulic system. The nose wheel steering, the thrust reversers, and the main landing gear brakes functioned.

Toxicological findings, initiated by the operator, for the mechanics and ground crew were negative.

Aircraft

Registration
N14336
Reported as
Boeing B-737-300
Category
Airplane
Serial number
23574
Airframe hours
26,118
Engine
CFM 56, 20,000 lbs thrust, turbo fan
Damage
Minor damage
Flight
Part 121
Operator
Continental Airlines, Inc.
Registered owner
State Street Bank And Trust
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · November 26, 1994 · 0 hours before
Destination
ORD · Chicago, IL
Flight plan
IFR
Airport
IAH · Houston Intercontinental

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
51
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Toxicology
Performed
Flight hours
20,000 total · 8,000 in this make and model · 15,000 as pilot in command · 210 in the last 90 days · 40 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 7 knots
Visibility
6 statute miles
Temperature
72 °F, dew point 72 °F
Altimeter
30.00 inHg
Observed at
IAH

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N14336 · 1

Matched to the same aircraft by N-number and date.