Garmin G1000 NXi, Дополнительное руководство по обслуживанию, Страница: 133 / 171

G1000 Supplemental Maintenance Manual Page 7-28
Textron Nav III Series Revision 3
190-02128-04
1. For GSU 75 installations, gain access to the aft avionics compartment in the tail of the
aircraft. Locate the tee fittings in the pitot and static lines just forward of the GSU 75 and
remove the capped nuts. Drain any condensation from the lines and tees. Reinstall the
capped nuts onto the tees and tighten, ensuring caps are facing downward.
NOTE: If tee fittings are not installed in the pitot and static lines, disconnect the lines
directly from the GSU 75 and drain any condensation from the lines. Reconnect the pitot
and static lines to the GSU 75 and tighten the nuts.
2. Perform pitot static system leak check as described in Chapter 34 of the appropriate
Cessna Maintenance Manual (refer to Table 1-1 for Manual details.)
3. Connect the pitot/static tester to the aircraft pitot and static ports.
4. Verify that the PFD altimeter baro setting is set to 29.92 in Hg (1013.25 mb).
5. Start the PFD in configuration mode and navigate to the GRS page. The values for
altitude and airspeed are shown on the AHRS/AIR DATA INPUT table as B ALT and IAS
for AIR DATA 1.
6. Simulate the altitudes shown in Table 7-1. Wait for ADTS to report that target values
have been achieved.
7. On Table 7-1, record the altitude (B ALT) displayed on the PFD for AIR DATA 1 for each
altitude.
8. Simulate the airspeeds shown in Table 7-1.
9. On Table 7-2, record the airspeed (IAS) displayed on the PFD for AIR DATA 1 for each
airspeed.
10. Verify that the indicated altitudes and airspeeds are within allowable tolerances.
11. File the results with the aircraft maintenance records.
If either the pilot or copilot air data system does not meet the tolerances specified, have
maintenance checks performed on the air data system or the pitot/static system.
Table 7-1, Altitude Test Points
Test Set Altitude
PFD Altitude Reading
(from B ALT field)
Allowed Tolerance
0 +/- 20
500 +/- 20
1000 +/- 20
1500 +/- 20
2000 +/- 20
4000 +/- 25
8000 +/- 30
11000 +/- 35
14000 +/- 40
17000 +/- 45
20000 +/- 50