Loss of control Accident Lockheed AC-130J Ghostrider 09-5710, Tuesday 21 April 2015
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Date:Tuesday 21 April 2015
Time:12:18
Type:Silhouette image of generic C30J model; specific model in this crash may look slightly different    
Lockheed AC-130J Ghostrider
Owner/operator:United States Air Force - USAF
Registration: 09-5710
MSN: 5710
Year of manufacture:2012
Fatalities:Fatalities: 0 / Occupants: 8
Other fatalities:0
Aircraft damage: Substantial, written off
Category:Accident
Location:76 km S of Valparaiso-Eglin AFB, FL (VPS) -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Military
Departure airport:Valparaiso-Eglin AFB, FL (VPS/KVPS)
Destination airport:Valparaiso-Eglin AFB, FL (VPS/KVPS)
Investigating agency: USAF AIB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The Lockheed AC-130J Ghostrider, assigned to the USAF's 413th Flight Test Squadron, 96th Test Wing, departed controlled flight over water to the south of Eglin AFB and then was recovered and landed safely. There were no significant injuries to the crew. Post-flight engineering analysis revealed that the mishap aircraft exceeded the Design Limit Load (DLL), thus rendering it unsafe for further flight.
The mishap occurred on a medium risk flying qualities test sortie out to the edges of the flight envelope. The pilot was attempting to execute a Steady Heading Sideslip (SHSS) to the RUDDER Special Alert of the Advisory Caution and Warning System (ACAWS). This is normally a prohibited maneuver, but the Director of Operations at Air Force Materiel Command (AFMC/A3) signed a waiver approving the test team to fly to this limit. The MA exceeded 14.5° Angle of Sideslip (AoS), triggering the RUDDER Special Alert and continued increasing AoS until it departed controlled flight, eventually tumbling to an inverted position. Shortly thereafter, the aircraft recovered from the departure and the copilot took the controls to recover from the near vertical dive. In the process of the departure and recovery, the aircraft lost approximately 5,000 feet of altitude, experienced 3.19 times the normal force acceleration (Gs), and over sped the flaps by over 100 knots. The over G exceeded the aircraft's Design Limit Load.

The Accident Investigation Board (AIB) President found, by a preponderance of the evidence, the cause of this mishap was the MP's [Mishap Pilot's] excessive rudder input during the test point followed by inadequate rudder input to initiate a timely recovery from high AoS due to Overcontrolled/Undercontrolled Aircraft and Wrong Choice of Action During an Operation.

Additionally, the AIB President found, by a preponderance of the evidence, the following factors substantially contributed to the mishap: Instrumentation and Warning System Issues, Spatial Disorientation, Confusion, and the fact the test team was Provided Inadequate Procedural Guidance or Publications.

Accident investigation:
cover
  
Investigating agency: USAF AIB
Report number: Final report
Status: Investigation completed
Duration: 5 months
Download report: Final report

Sources:


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