However it used an engine based on the P&W JT8D which made it subject to US export approval. For this reason,for example, it lost a big export order to India.

However it used an engine based on the P&W JT8D which made it subject to US export approval. For this reason,for example, it lost a big export order to India. SAAB had originally considered the British Olympus engine for the Viggen, which would have had higher fuel consumption but faster responsiveness and no export tangles.