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NOTE
Because the automated altitude self-test functionality is always inhibited during operation
at 250 ft AGL or below (except during unit power-up), if extended flying time below 250 ft
AGL is expected (such as in certain rotorcraft operations) it is recommended to install
provisions to utilize the manually initiated altitude self-test functionality (see
for more information). Manual altitude self-test functionality may then be used (and thus
altitude sensing and processing integrity may be verified) during extended operations
below 250 ft AGL.
3.8 Continued Airworthiness
Maintenance of the GRA 5500 is "on condition" only.
NOTE
It is the installer's responsibility to properly document any Instructions for Continued
Airworthiness as may be required by the local aircraft certification authorities.
GRA 5500 Installation Manual
Page 3-18
Section 4.4.1
190-01277-00
Rev. A
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