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ASN Wikibase Occurrence # 217204
Last updated: 18 November 2021
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Date:30-OCT-1995
Time:18:10
Type:Silhouette image of generic B735 model; specific model in this crash may look slightly different
Boeing 737-5H4
Owner/operator:Southwest Airlines
Registration: N508SW
MSN: 24185/1932
Fatalities:Fatalities: 0 / Occupants: 97
Other fatalities:0
Aircraft damage: None
Category:Incident
Location:Las Vegas, NV -   United States of America
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Las Vegas-McCarran International Airport, NV (LAS/KLAS)
Destination airport:San Antonio International Airport, TX (SAT/KSAT)
Investigating agency: NTSB
Narrative:
The aircraft was climbing through about 4,500 feet agl on a standard instrument departure route when the first officer, who was the flying pilot, said a laser beam swept past the cockpit and he immediately experienced eye pain and was completely blinded in the right eye. After image effects also induced a blind condition in his left eye. He said the total inability to see lasted 30 seconds, and for an additional 2 minutes, he could not focus on or interpret any instrument indications and was completely disoriented in his spatial relationship to the vertical. The captain was not irradiated by the beam and assumed control of the aircraft and continued the climb. Many of the larger hotels in Las Vegas have some sort of outdoor laser light show. Most of these installations have both fixed/stationary (static) beams of relatively high power and 'dancing' beams of lower power which flash about the sky in irregular patterns. Recorded radar data was used to perform a trajectory and vehicle attitude study to determine the relative position of resorts with laser shows to the position and orientation of the aircraft. As the aircraft passed through 7,000 feet, the positions of three resorts relative to the aircraft were all located in the clear vision field of view of the first officer, and at a position of less than 90 degrees relative azimuth from the first officer's eye reference point. One had the shortest three dimensional distance to the aircraft at 4.7 nautical miles, while the other two were at three dimensional distances of about 7 nautical miles. The source of the laser could not be established with certainty. Fifty-one prior incidents of laser irradiations to pilots have been recorded by the Las Vegas air traffic facility over the past 2 years. FAA Order 7400.2D in effect at the time contains guidelines for FAA personnel in the approval process for determination of whether a proposed outdoor laser light display is compatible with navigable airspace. The order defines two areas: the Nominal Ocular Hazard Distance (NOHD); and the Eye Safe Distance (ESD). NOHD is defined as the distance from the point source where the irradiance level in power and area footprint can cause permanent thermal damage to the retina. ESD encompasses all other irradiance exposures where biological damage to the eye should not occur. Approval requires only that the laser beam be classed as ESD in navigable airspace. The approval process does not consider such laser exposure effects as flashblindness, afterimage, startle, and high glare conditions on pilot performance.

Probable Cause: The flying pilot's inadvertent exposure to an unidentified ground-based laser beam. A factor in the incident is the lack of appropriate standards by the FAA and FDA for laser light exposure levels to aircrew in navigable airspace.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001207X04715&key=1

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration:
Download report: Final report
Safety recommendations:

Safety recommendation A-97-13 issued 26 February 1997 by NTSB to FAA
Safety recommendation A-97-14 issued 26 February 1997 by NTSB to FAA
Safety recommendation A-97-15 issued 26 February 1997 by NTSB to FAA


Images:

Photo of N508SW courtesy AirHistory.net


Phoenix - Sky Harbor International (KPHX / PHX)
24 September 2007; (c) LRS747

Revision history:

Date/timeContributorUpdates
03-Nov-2018 20:35 ASN Update Bot Added
03-Nov-2018 20:38 harro Updated [Cn, Operator, Phase, Nature, Departure airport, Destination airport, Narrative]

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