compass split

[palebird]

What is the max complass split on a commercial aircraft with two slaved systems..anybody know where they hid this in the CARS?

[HS-748 2A]

Palebird, just happen to have the 737-200 M.M. specs right handy; "+ or - (1) degree" (34-21-0)

I know though that's not the info you're looking for, and the CARs somehow I think, spec out a more lax minimum standard.

I'm no CARs expert however so I'll just have stick to the exacting standards of the MM and dispatch perfect airplanes.

(in my case)



'48

[Grease Nipple]

It is not in CAR's. You can sometimes find it in the AMM but in many cases they just give the tolerance for each individual system.

[black hole]

If I remember right the E & I manual said 3 Deg.

BH

[Big Pistons Forever]

What is the max complass split on a commercial aircraft with two slaved systems..anybody know where they hid this in the CARS?

The last time I asked that question I got this answer "One degree more than what ever the split is "

[dashx]

All readings must be within plus/minus 1 degree of actual magnetic
headings.

Dash 8 34-21-00 AHRS.

Monitor the compass cards and make sure that they come back to the current
aircraft magnetic−heading. Make sure that the heading difference between
AHRS 1 and AHRS 2 is less than ± 2 degrees

CRJ 34-21-00 AHRS.

http://www.tc.gc.ca/civilaviation/regse ... /a625c.htm

(b) The annual calibration requirement of (a) does not apply to an aircraft operating under an air operator certificate, or to any large or turbine-powered pressurized aircraft, where:

(i) the aircraft is equipped with two independent stabilized magnetic direction indicators in addition to the non-stabilized direct reading magnetic direction indicator; and

(ii) a procedure for monitoring and recording the performance of the magnetic direction-indicators is detailed in the flight training unit's, or in the air operator's approved maintenance control manual approved pursuant to CAR 406 and CAR 706 respectively

So according to this the air operator must adhere to their own MCM (follow manufacturer's calibration criteria)

Which means the split would be 2 degrees. At least to me.

[palebird]

Clear as mud Thanks for all the replies..