Perhaps not the best example you could have chosen. The response was not what Bombardier was looking for, even though Part 91 operators/pilots got tossed a very nice bone.
The question in the Coleal letter was framed very narrowly. We got a huge bonus from the answer, but the question itself was tightly phrased so that any significant negative response would do very little harm.
While your question was framed in the context of transport category aircraft, your
inquiry, including as supplemented by Mr. Hernandez, is specific to the Learjet Model 60
aircraft. You referenced an FAA Continued Operational Safety (COS) initiative in
which, in November 2008, the FAA 's Wichita ACO (Aircraft Certification Office)
requested an AFM (Airplane Flight Manual) limitation for the Learjet Model 60 that
would requi re daily tire pressure checks. The issue, as you alluded to in your letter, is
whether checking tire pressure on the Learjet Model 60 is considered to be a maintenance
or preventive maintenance function, versus a simple preflight inspection task. Your
correspondence correctly observed that, under 14 C.F.R. § 43.3(g), for aircraft not
operated under part 121, 129, or 135 (e .g., part 91), a pilot may perform preventive
maintenance on an aircraft operated by that pilot.
In fact, Mr. Coleal did NOT get the response he desired: that checking tire pressure is just a simple pre-flight task on the Learjet 60, rather than a maintenance item.
...because checking tire pressure is but a
simplistic and small subset of the tasks necessary in removing, installing, and repairing
landing gear tires, it does not rise to the level of even preventive maintenance, and should
therefore be considered an appropriate pre-flight inspection task. We do not agree.
.
.
.
We have discussed this issue with officials in the FAA's Flight Standards Service
Aircraft Maintenance Division (AFS-300) and concur with their determination that
checking tire pressure on a Learjet Model 60 aircraft is preventive maintenance and not a
simple pre-flight inspection task. We believe their determination is a reasonable one
based on the re levant facts and circumstances. These include the high tire air pressure
(up to 219 psig), the need for a proper and calibrated gauge, and the possibility of an
incorrect reading if the check is not performed properly.
So it's not a pre-flight item. A pilot can do the pressure check as PM when operating under Part 91, but
not under Part 135 so an A&P has to do the required daily check. Not what Mr. Coleal was looking for, but it didn't really make things much worse.