DCA12CA043

NTSB accident investigation · Airbus Industrie A320 211 · Minneapolis, MN · November 10, 2011

Accident · No injuriesData collectionFinal report
Date
November 10, 2011, 11:45 local (17:45 UTC)
Place
Minneapolis, MN
Injuries
150 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N331NWAirbus Industrie A320 211
Defining event
Initial climb: Birdstrike
Weather
Day
Status
Completed · report September 5, 2018
Report
Approved by Office Director
NTSB office
Major Investigations Division
Case key
82961

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

On this page

Probable cause

In-flight collision with birds during initial climb, which resulted in substantial damage to the aircraft.

Findings · 1

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Object/animal/substance: animal(s)/bird(s)Environmental issues › Physical environment · Effect on equipmentAirbus Industrie A320-211: 2 casesAll aircraft: 358 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

On November 10, 2011, at about 1157 central standard time, Delta flight 1691, an A320-211, N331NW, experienced a bird strike during initial climb after departure from Minneapolis-St. Paul International Airport (KMSP), Minneapolis, Minnesota. There were no injuries to the 150 passengers and crewmembers onboard and the airplane was substantially damaged. The flight was operating as a 14 Code of Federal Regulations Part 121 regularly scheduled passenger flight from KMSP to Reno–Tahoe International Airport (KRNO), Reno, Nevada. According to the flight crew, a flock of "50-100" large white birds, possibly geese, appeared in front of the airplane during initial climb. The first officer, who was the pilot flying, increased the rate of climb to attempt to avoid the flock, but at least one bird made impacted the aircraft. After striking the bird, the flight crew received an Electronic Centralized Aircraft Monitor message for loss of cabin pressure and the right side airspeed indication became erratic. The flight crew declared an emergency and made an uneventful landing back at KMSP. Examination of the aircraft after landing revealed substantial damage to the forward pressure bulkhead and minor damage to the right engine.

Factual narrative

On November 10, 2011, at about 1157 central standard time, Delta flight 1691, an A320-211, N331NW, experienced a bird strike during initial climb after departure from Minneapolis-St. Paul International Airport (KMSP), Minneapolis, Minnesota. There were no injuries to the 150 passengers and crewmembers onboard and the airplane was substantially damaged. The flight was operating as a 14 Code of Federal Regulations Part 121 regularly scheduled passenger flight from KMSP to Reno–Tahoe International Airport (KRNO), Reno, Nevada. According to the flight crew, a flock of "50-100" large white birds, possibly geese, appeared in front of the airplane during initial climb. The first officer, who was the pilot flying, increased the rate of climb to attempt to avoid the flock, but at least one bird made impacted the aircraft. After striking the bird, the flight crew received an Electronic Centralized Aircraft Monitor message for loss of cabin pressure and the right side airspeed indication became erratic. The flight crew declared an emergency and made an uneventful landing back at KMSP. Examination of the aircraft after landing revealed substantial damage to the forward pressure bulkhead and minor damage to the right engine. Photo of bird strike to radome Photo of Bird strike damage to right engine Photo of bird strike damage to E and E bay Photo of bird recovered from E and E bay

Aircraft

Registration
N331NW
Reported as
Airbus Industrie A320 211 (211)
Category
Airplane
Serial number
318
Built
1992
Airframe hours
59,784
Engines
CFM Intl. CFM-56-5A1, 25,000 lbs thrust, turbo fanCFM Intl. CFM-56-5A1/F, 25,000 lbs thrust, turbo fan
Damage
Substantial damage
Flight
Part 121
Operator
Delta Air Lines Inc
Registered owner
Delta Air Lines Inc
Airworthiness certificate
Standard, Transport
Last inspection
AAIP · October 22, 2011
Departed
KMSP · Minneapolis, MN
Destination
RNO · Reno, NV
Flight plan
IFR
Airport
KMSP · Minneapolis-St Paul Intl/Wold-, runway 30R, 8,200 × 150 ft, concrete
Equipment
Unknown

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 · 5

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
51
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Unknown
Last flight review
June 29, 2011
Seat
Left
Restraint
5-point
Flight hours
13,191 total · 6,307 in this make and model · 154 in the last 90 days · 1 in the last 24 hours
Role
Co-pilot
Age
49
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Unknown
Last flight review
April 28, 2011
Seat
Right
Restraint
5-point
Flight hours
8,154 total · 5,553 in this make and model · 128 in the last 90 days · 1 in the last 24 hours
Role
Cabin crew
Injuries
None
Seat
Rear
Role
Cabin crew
Injuries
None
Seat
Rear
Role
Cabin crew
Injuries
None
Seat
Rear

Weather

Conditions
Day
Wind
300° at 11 knots, gusting 24
Visibility
10 statute miles
Lowest ceiling
5,000 ft overcast
Temperature
37 °F, dew point 25 °F
Altimeter
30.04 inHg
Turbulence
Unknown
Observed at
KMSP

Docket · 9

The files NTSB released with the investigation on August 14, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.8 MB in all.

Other investigations on N331NW · 3

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