HH40
1981-JUL-20 · Near Balad, Somalia

Somali Airlines — Flight HH40

Somali Airlines Flight 40 crashed shortly after takeoff from Mogadishu when it encountered severe turbulence and heavy rain. The aircraft entered a high-speed spiral dive that generated aerodynamic loads far exceeding its design limits, resulting in the structural failure and separation of the right wing.

Aircraft
Fokker F-27 Friendship 600RF
Registration
6O-SAY
Phase
Cruise
Cause
Weather
Souls on Board
50
Fatalities
50
Origin → Dest
Mogadishu International Airport (MGQ) → Hargeisa Airport (HGA)
Report
Final

Investigation Summary

Eight minutes after departing Mogadishu for Hargeisa, the Fokker F-27 entered a localized area of intense thunderstorm activity. The aircraft was subjected to violent vertical gusts that led to a loss of control and a subsequent spiral dive. During the attempted recovery or the dive itself, the airframe was subjected to loads measured at approximately 5.76 g. The Fokker F-27's design stress limit was significantly lower than this value, leading to the catastrophic separation of the right wing. The wreckage fell near the town of Balad, and the post-impact fire was so intense that rescuers reported little hope of identifying individual victims.

Final Conclusions

The investigation concluded that the primary cause was an encounter with severe turbulence and vertical gusts that led to a loss of control. The resulting spiral dive induced G-loads (5.76 g) that exceeded the aircraft's structural design limits, causing the right wing to detach. Contributing to the accident was the flight crew's decision to take off into known thunderstorm conditions.

Video Analysis

No video analysis linked for this case file yet.

Airframe & Maintenance

Airframe Hours
6,087
Cycles
2,777
Engines
Rolls-Royce Dart

Systems & Failure Modes

i

Right Wing Structure

Suffered catastrophic failure and separation after G-loads exceeded the design stress limit.

i

Attitude Indicator

Post-accident reports suggested a possible fault in this instrument, though investigators found no direct correlation to the crash.

Interesting Facts

  • 01The aircraft was only four years old at the time of the accident.
  • 02The flight was carrying 50 people in total, consisting of 44 passengers and 6 crew members.
  • 03Among the victims was General Omar Osman Diriye of the Somali National Army, who died alongside his wife, four children, and three brothers.
  • 04Notable foreign victims included Margaret Mary Ssebunnya (a Ugandan nurse with World Vision), Arvind Kumar (an Indian businessman), and Roman Hoelldobler (a West German national).
  • 05The crash site was described by witnesses as a heap of charred wreckage with no chance of identifying victims.
  • 06The accident resulted in the loss of one of only two Fokker F-27s in the Somali Airlines fleet.
  • 07All 50 victims were buried with military honors in a mass funeral the following day.

Safety Actions & Advisories

Operational Restrictions

Following the crash and reports of poor maintenance on the remaining fleet, the U.S. Ambassador to Somalia issued orders prohibiting American personnel from flying on Somali Airlines' remaining Fokker F-27.

Known Controversies & Unanswered Questions

Allegations of Coerced Flight

Reference ↗

Former U.S. Ambassador Peter S. Bridges claimed the pilot initially refused to fly due to the aircraft's poor mechanical condition but was threatened with imprisonment by authorities if he did not take off.

Disputed Weather Conditions

Reference ↗

Some local accounts and aviation experts disputed the official finding of a thunderstorm, noting that Mogadishu rarely experiences such weather in July, suggesting spatial disorientation as an alternative cause.

Location

Near Balad, Somalia · 2.3550, 45.3930

Case File History

  1. New evidenceUpdated findings.
  2. New evidenceUpdated findings.

Related Cases

Case ID · somali-airlines-40-1981Last updated · Filed

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