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| Disposition of the CH-47B Helicopters |
| In service to the United States Army |
| As of December 2002, we had generally a good idea what became of most of the B model Chinooks. Many of the details surrounding the demise of most of the known lost aircraft has remained a mystery. There are no surviving U.S. Army B models. |
| Airframe Losses |
| [Excluding those lost in the Republic of Vietnam] |
| --- Crashed at Fort Sill, Oklahoma --- |
| One 27 September 1977, one airframe was lost due to mechanical failure when the sprag clutch in the number two engine transmission suddenly engaged while ground taxiing after a touchdown autorotation, destroying the aircraft: |
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| --- Crashed in Columbia, South America --- |
| On 19 August 1980, one airframe was lost in an accident when the aircrew attempted to cross a mountain pass with insufficient power available and in deteriorating weather conditions: |
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| --- Foreign Sales --- |
| One airframe was sold to the United Kingdom and was otherwise unaccounted for: |
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| --- Airframes Lost Due To Accidents --- |
| One airframe was lost in the Continental United States (CONUS) (Details Unknown): |
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| On 4 October 1984, one airframe was lost in an accident in CONUS while attempting to land on a 25 degree upslope: |
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| Airframe Losses In The Republic Of Vietnam |
| --- Airframes Lost Due To Accidents --- |
| Five airframes were lost due to accidents: |
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| One airframe was lost due to an accident during a maintenance test flight: |
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| One airframe was lost in an accident during the enroute crash of a transport C-133 aircraft, near Lowery Air Force Base, while being airlifted to New Cumberland Army Depot (NCAD), Harrisburg, Pennsylvania: |
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| One airframe was lost when the forward transmission seized during hot re-fueling: |
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| One airframe was lost when the aft transmission seized in-flight: |
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| One airframe was lost when it ran out of fuel: |
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| One airframe was lost when an Upper Boost Actuator Pilot Valve broke in-flight: |
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| One airframe was lost in a ground taxi accident: |
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| One airframe was lost in a mid air collision with a UH-1: |
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| One airframe was lost, when following an accident and having landed, was deliberately destroyed to prevent capture by the enemy: |
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| --- Destroyed on the ground by the Enemy --- |
| Three airframes were destroyed on the ground by the Viet Cong: |
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| One airframe was destroyed on the ground by a rocket: |
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| --- Shot Down In Combat --- |
| One airframe was shot down by a mortar hit in the radio and flight control closet on approach: |
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| Four airframes were shot down by small arms fire (under 50 Caliber): |
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| One airframe was shot down by small arms fire (under 50 Caliber) while on a combat re-supply mission in Laos: |
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| Three airframes were shot down by large caliber fire (50 caliber or greater): |
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| --- Converted To D Model --- |
| One airframe was selected as a prototype for the B model conversion to D model: |
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| The remaining 75 B model Chinook helicopters were converted to D models: |
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