A Boeing CH-47C Chinook conducts flight testing with external cargo hooks. Modifications to the aircraft consisted of the addition of two hooks, each with a 20,000-lb capacity, forward and aft. The existing center cargo hook was retained. The control system provided for individual and/or simultaneous release of loads from each of the hooks. Testing was done at airspeeds up to 100 knots. From Vertiflite, May/June 1974 (page 21).

US Army CH-47C Chinook (815859) demonstrating triple-hook capability

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A Boeing CH-47C Chinook conducts flight testing with external cargo hooks. Modifications to the aircraft consisted of the addition of two hooks, each with a 20,000-lb capacity, forward and aft. The existing center cargo hook was retained. The control system provided for individual and/or simultaneous release of loads from each of the hooks. Testing was done at airspeeds up to 100 knots. From Vertiflite, May/June 1974 (page 21).

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