arj1 wrote:
@Airborne_Again, the question is: if there is aircraft A with, say, GNS430 installed before a certain paperwork was released and then there is an aircraft B, done afterwards, what is the procedure to remove that “VFR only” sticker on aircraft A:
1. remove all the hardware, install it from scratch or
2. test all hardware and cables, ensure it complies with a major/minor mod (no interference etc), change the cables and/or antennae as needed or
3. something else?And who can do it for a G-reg?
As far as I understand, it is “something else”. The question is not (primarily) whether the equipment was properly installed from a hardware point of view (although that could possible also be a factor) but rather that you must convince the authority that the equipment is safe to use as installed.
Possibly the authority may not feel that it is safe to navigate using the CDI indication on the GPS display and instead demand a separate CDI. Or they may demand separate annunciators unless the GPS is sufficiently near the centre of the pilot’s field of vision.
An example of this process was that 5 or so years ago, a British company developed an STC to allow LPV operations with the GNS430W/530W. That STC could be applied directly to already existing installations as long as certain conditions were fulfilled.
In the US, the FAA dealt with legacy equipment that did not have approvals in the existing AFMS for RNAV 1 by publishing a document referenced in AC 90-100A called the AC 90-100A Compliance Document
Other AC describe the requirements for various RNP Operations:
AC 90-100A includes:
Required Navigation Performance Approach (RNP APCH) procedures;
•Barometric vertical navigation (baro-VNAV);
•RNP 1 (terminal) operations;
•RNP 0.3 (rotorcraft) operations;
•RNP 2 domestic, offshore, oceanic, and remote continental operations;
•RNP 4 oceanic and remote continental operations;
•RNP 10 (Area Navigation (RNAV) 10) oceanic and remote continental operations;
•Advanced Required Navigation Performance (A-RNP), and
•Additional Capabilities
AC 90-107 includes LPV and LP
AC 90-108 includes use of RNAV on conventional routes and procedures.
