Avionics
STCs unnecessary for some TAWS installations
In a welcomed shift in policy, business aircraft operators may now forego the STC process when installing class-B terrain awareness and warning systems (TA

In a welcomed shift in policy, business aircraft operators may now forego the STC process when installing class-B terrain awareness and warning systems (TAWS). That was the word handed down by the FAA’s certification branch to FSDOs recently, published as a flight standards airworthiness bulletin (FSAW 02-03A) directed to avionics safety inspectors.

In the bulletin the FAA spelled out the procedure change, which allows hundreds of Part 91 and 135 operators affected by the TAWS rule to install the required equipment under the less stringent FAA Form 337 field-approval process–provided that an STC has been approved previously in a “similar installation.”