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Posted for "Bob Chesley" <bobchesley@earthlink.net>

Carl,

I too was nonplussed by Parker Aerospace's Service Letter 31.  When it states that a backup pneumatic system or a backup electric attitude gyro MUST be installed in ALL aircraft which fly IFR and that this warning must be permanently retained in the POH, it sounds like it has the force of the FAA behind it.

I called the 800 (382-8422) number given and found that they were a little sheepish about the notice.  While the rationale may make sense in that high load, hard IFR may well be a problem with GA pilots when a vacuum system goes bad and they are left with needle, ball and airspeed, there is no requirement to run out and buy a $3,000 backup electric gyro.

Bob Chesley
LNC2 - N4YH

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