The designation of the first four pre-production aircraft.

Prototypes and a small number of pre-production aircraft are in service with the Chinese military for evaluation.

The Z.1007bis was ordered into large scale production, deliveries of pre-production aircraft starting late that year.

He 162 A-0 - first ten pre-production aircraft.

At least the pre-production aircraft appear to have been built by 2008.

Two pre-production aircraft designated 200B were built of mixed construction and the first flew on 19 May 1983.

Flight testing continued through 28 April, when the last of the seven pre-production aircraft took to the air.

Both pre-production aircraft were used to further develop the design of the aircraft.

Sikorsky had proposed to build four pre-production aircraft for operational evaluations.

Three pre-production aircraft were built for trials, and sales and demonstrations.