CHI86MA142

NTSB incident investigation · Mcdonnell Douglas DC-9-31 · Chicago, IL · May 17, 1986

Incident · No injuriesMajor investigationFinal report
Date
May 17, 1986, 09:59 local (14:59 UTC)
Place
Chicago, IL
Injuries
224 uninjured
Phase of flight
Takeoff
Aircraft
N973VJMcdonnell Douglas DC-9-31N6833Boeing 727-223
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Safety recommendations
Yes
Case key
13538

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.

Near collision between aircraftTakeoff - roll/run
Ifr separation standards - not followedAtc personnel(lcl/gnd/clnc)Cause
Excessive workload (task overload)Atc personnel(lcl/gnd/clnc)Factor
Supervision - inadequateAtc personnel(supervisor)Factor
Excessive workload (task overload)Atc personnel(supervisor)Factor
Near collision between aircraftTakeoff - roll/run
Atc clearance - inadvertentAtc personnel(lcl/gnd/clnc)Cause
Excessive workload (task overload)Atc personnel(lcl/gnd/clnc)Factor
Supervision - inadequateAtc personnel(supervisor)Factor
Excessive workload (task overload)Atc personnel(supervisor)Factor

Analysis

U.S. Air flight 373 passed over American airlines flight 695 at the intersection of runways 32R and 4L while both aircraft were taking off. Both aircraft had been cleared for takeoff by the local controller at o'hare tower. The aircraft came within twenty feet of each other during the occurrence. The local controller was involved in giving additional severe weather avoidance (swap) clearances when he inadvertently forgot he had cleared the U.S. Air flight for takeoff and then about 20 seconds later cleared the American flight for takeoff.

U.S. Air flight 373 passed over American airlines flight 695AT the intersection of runways 32R and 4L while both aircraft were taking off. Both aircraft had been cleared for takeoff by the local controller at o'hare tower. The aircraft came within twenty feet of each other during the occurrence. The local controller was involved in giving additional severe weather avoidance (swap) clearances when he inadvertently forgot he had cleared the U.S. Air flight for takeoff and then about 20 seconds later cleared the American flight for takeoff.

Aircraft · 2

Registration
N973VJ
Reported as
Mcdonnell Douglas DC-9-31
Category
Airplane
Engine
P&W JT-9D, 14,500 lbs thrust, turbo fan
Damage
Minor damage
Flight
Part 121
Registered owner
Usair
Airworthiness certificate
Standard, Transport
Departed
ORD · Chicago, IL
Destination
PIT · Pittsburgh, PA
Flight plan
IFR
Airport
ORD · O'Hare, runway 4L, 7,500 × 150 ft, concrete

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.

Registration
N6833
Reported as
Boeing 727-223
Category
Airplane
Engine
P&W JT-9D, 14,500 lbs thrust, turbo fan
Damage
No damage
Flight
Part 121
Registered owner
American Airlines
Airworthiness certificate
Standard, Transport
Destination
OKC · Oklahoma City, OK
Flight plan
IFR
Airport
ORD · O'Hare, runway 32R, 10,003 × 150 ft, concrete

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot, aircraft N973VJ
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Role
Pilot, aircraft N6833
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left

Weather

Conditions
Visual (VMC) · Day
Visibility
5 statute miles
Lowest ceiling
2,000 ft broken
Altimeter
29.00 inHg
Observed at
ORD