Three prototypes and an evaluation batch of five BV 141As were produced, backed personally by Ernst Udet, but the RLM decided on April 4, 1940 that they were underpowered, although it was also noted they otherwise exceeded the requirements. By the time a batch of 12 BV 141Bs were built with the more powerful BMW 801 engines, they were too late to make an impression, as RLM already decided to put the Focke-Wulf Fw 189 Uhu into production. Indeed, an urgent need for BMW 801 engines for use in the Focke-Wulf Fw 190 fighter aircraft reduced the chance of the BV 141B being produced in quantity.

Several wrecked BV 141s were found by advancing Allied forces. One was captured by British forces and sent to England for examination

Sources:
Brown, Eric, Captain - Wings of the Luftwaffe , 1979, Airlife Publishing Ltd., Shrewsbury
Gunston, Bill & Wood, Tony - Hitler's Luftwaffe , 1977, Salamander Books Ltd., London
The Complete Encyclodepia of World Aircraft, 1997, Barnes & Nobles Books, ISBN: 0 7607 0592 5
Wikipedia - Blohm & Voss Bv 141