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C-141 64-9405 & Luftwaffe 74

Accident Case Study

Flying over most of Africa not too long ago was an exercise in faith. There was very little radar and en route air traffic control depended on everyone filing an accurate flight plan, adhering to that flight plan, and broadcasting their position in a timely manner.

There was much that could go wrong, as this mishap shows.


 

Accident Report

First Aircraft:

images

Photo: C-141 Tail Number 65-9405, (C-141 Heaven)

  • Date: 13 SEP 1997
  • Time: 17:10
  • Type: Lockheed C-141B Starlifter
  • Operator: United States Air Force - USAF
  • Registration: 65-9405
  • Fatalities: 9 of 9 crew
  • Aircraft Fate: Destroyed
  • Phase: En route
  • Airports: (Departure) Windhoek-Hosea Kutako International Airport (WDH/FYWE), Namibia; (Destination) Georgetown-Wideawake Field (ASI/FHAW), St. Helena

Second Aircraft:

images

Photo: Luftwaffe Tupolev Tu-154M, 29 Sep 1993 (Torsten Maiwald)

  • Type: Tupolev 154M
  • Operator: German Air Force (Luftwaffe)
  • Registration: 11+02
  • Fatalities: 10 of 10 crew, 14 of 14 passengers
  • Aircraft Fate: Destroyed
  • Phase: En route
  • Airports: (Departure) Niamey Airport (NIM/DRRN), Niger; (Destination) Windhoek (WDH/FYWH), Namibia

Narrative

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Figure: Assigned Courses of the Two Missing Aircraft, from C-141 Heaven

[Aviation Safety Network]

  • At approximately 1510 hours UTC, 65 nautical miles west of the Namibian, coast, a US Air Force C-141B Starlifter collided with a German Air Force (Luftwaffe) Tupolev 154M in mid-air. The C-141B, serial number 65-9405 was using the call sign REACH 4201 and was operated by the 305th Air Mobility Wing; the Tupolev used the call sign GAF 074.
  • At 1411 UTC, REACH 4201 had departed from Windhoek, Namibia. The aircraft was at its filed for and assigned cruise level of 35,000 feet (FL350). The aircraft was on its filed for and assigned flight plan routing.
  • Earlier at 1035 UTC, GAF 074 departed Diori Hamani International, Niamey, Niger, after refueling, continuing to its next refueling stop at Windhoek. At the time of the accident, the aircraft was not at its filed for cruise level of FL390 but was still at its initially assigned cruise level FL350. The aircraft was on its filed for and assigned flight plan routing.
  • Filed flight plans in Africa often call for a change in altitude, depending on the direction of flight or any particular airway requirements. Even without radio contact with a controlling agency, crews were expected to adjust altitudes according to the filed flight plans.

  • Windhoek ATC was in sole and continuous radio contact with REACH 4201 on VHF 124.7. The agency did not know GAF 074's movement. Luanda ATC, at one time, was in radio contact with GAF 074 on HF 8903, but they were not in radio contact with REACH 4201. Luanda ATC did receive flight plans for both aircraft but a departure message for only REACH 4201.

Probable Cause

[Aviation Safety Network]

  • GAF 074 flying a cruise level (FL350) which was not the level they had filed for (FL390). Neither FL350 nor FL390 were the correct cruise levels for that aircraft's magnetic heading according to International Civil Aviation Organization regulations. The appropriate cruise level would have been FL290, FL330, FL370, FL410, etc.
  • A substantially contributing factor was ATC agency Luanda's poor management of air traffic through its airspace. While ATC communications could be improved, ATC agency Luanda did have all the pertinent information it needed to provide critical advisories to both aircraft. If ATC agency Luanda was unable to contact GAF 074, it should have used other communication means (HF radio, telefax or telephone) to contact REACH 4201 through ATC agency Windhoek, as outlined in governing documents.
  • Another substantially contributing factor was the complicated and sporadic operation of the Aeronautical Fixed Telecommunications Network (AFTN). Routing of messages to affected air traffic control agencies is not direct and is convoluted, creating unnecessary delays and unfortunate misroutings. Specifically, ATC agency Windhoek did not receive a flight plan or a departure message on GAF 074, which could have been used by the controllers to identify the conflict so they could have advised REACH 4201.

References

Aviation Safety Network

http://www.c141heaven.info/dotcom/65/pic_65_9405.php

Revision: 20120101
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