Instrument and ease of use/accuracy:
When I spoke to the Sales Manager at the DG Factory about the instruments we
were fitting to our DG1000S 4-5 years ago, he expressed his opinion that the
the 57mm items were not as accurate or as easy to maintain as the equivalent
80mm version made by the same instrument factory. (Miniaturization in
mechanical devices is not as easy/reliable as it may be in electrical
circuitry)
I wasn't in a position to change our order and sure enough, when our two
brand new 57mm Altimeters turned up, one of them was about 10hP (300ft) out
on the subscale. It was fixed up under warranty but one has to ask the
question; was it more susceptible to damage/loss of calibration during
transit where-as perhaps the larger version may have travelled better?
Of greater concern though, when the chips are down, the bigger instrument
might just be that little bit quicker to locate, read and its vital
information that much easier to process safely. Not important with the
altimeter but perhaps a life saver when it comes to the ASI. This is
particularly so with a club ACFT due to the higher utilisation by low time
pilots where the club should be providing the safest option...particularly
where this is also the cheaper option.
Kind regards,
Daryl Mackay
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