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what the manufacturer would like to achieve
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No it is NOT what the manufacturer would like, hope, might, or any other passive, obscure description.
As it is labeled, it is what the
manufacturer guaranteed and what was accepted by the customer.
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but does not say anything about the overall performance, especially top speed.
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Sure it does. You do understand that these are complicated machines and they don't just roll off an assembly line into the squadron ready line.
A newly manufactured aircraft is one of the most dangerous things in aviation. It is unproven.
A very thorough inspection is completed before the first test flight. The manufacturer will put the aircraft thru a test flight period to ensure it reaches its numbers before turning it over to the customer who again goes thru their own prescribed regiment of test/inspections before accepting it.
When an airframe reaches the end of the assembly line, it was not uncommon for it to remain there for a month or so as it was tweaked and refined before being accepted.
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Undercarriage tests followed before the aircraft was lowered onto its wheels and rolled out of the final assembly hall. It was then led to the firing stand to test its weapons and also for centring the compass on the rotable compass adjustment stand. After fuelling, and a last check of all functions, the engine was subjected to a test run, whereafter the Bf-109 stood ready for a works flight. In the initial test flight it was climbed to 8,000m (26,250ft), the aircraft and the engine was thoroughly checked out and performance data compared with that required. In the event that faults were found, these would be recorded and eliminated after the landing. This was then followed by a works test flight in which it could be established how many of the faults had been rectified. Where no further faults were determined on this flight, the aircraft was then release for acceptance by the BAL. In Regensbug, several pilots (Obermeier, Lohmann and others) were authorised by the RLM to carry out Bf 109 acceptance flights for the BAL. After their acceptance by the BAL, the aircraft were then taken over by the Luftwaffe.
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Nest of Eagles: Messerschmitt Production and Flight-testing at Regensburg 1936-1945", de P. Schmoll, Classic Publications (2010).