Short overview from what we see and know.
- there are payload specific stc's and payload size defined stc's (we have both)
- most are payload sized defined
- payload specific(all up stc's) are usually more common on searchlights that need lots of wiring and draw big amps
- to install payloads that are at or below the parameters of the size stipulated in the rfm, what we almost always see is a full structural / electrical engineering reports, do160 testing and in many cases awrs to back up the payloads ability to do the job.
- in addition, with our stc's we have a check list of ground and flight tests that must be done with any new payloads. 100% we see people taking the high road and not short cutting. in other words, we dont see stupid stuff often.
- we have many very large mounts that DO NOT require any airframes mods, but they 100% do have stc approvals.
- bottom line, if its on the outside and has drag, best to have an stc, engineeering, testing, etc
- yes, there is alot of grey areas in wording from various governing agencies and what is done in the field. with over 3000 mounts in service and having been in the industry since 1984, cant remember the last time i really was taken back by an install. just the opposite