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B
Additionally, if the aircraft static system was opened or modified to add an
encoder, the static system must be tested and approved by a licensed
mechanic or authorized repairman. Improper use of the pitot-static test set
can result in damage to altimeters, vertical speed indicators, etc.
P.
Start with the pitot-static test set at current field elevation. Set the reference
altimeter in the test set for 29.92 IN. Hg.
Q.
On the PC, select the Data display mode (F6). With the system receiving
GPS signals and no faults reported, you should now verify that the system
has correctly identified your closest airport. Look at the following items on
the PC display:
CrwyApt
CRwyDist nm
Verify that the displayed information agrees with your geographic location.
R.
Set the pitot-stat test set to -1000 feet, exercise caution to avoid excessive
pressure changes to the static system of the aircraft. Verify that the PC dis-
play shows the item named Gillham Alt ft. at -1000 feet ± 100 feet.
S.
Set up the pitot-static test set to allow an ascent to 30,000 feet, or to the
maximum altitude of the lowest rated device attached to the static system.
If, for example, the aircraft uses a blind encoder rated to 25,000 feet; the
altitude to climb to would be 25,000 feet.
You must verify that all equipment connected to the static system can
safely be driven to your test altitude. If you go above 30,750 feet, the Gill-
ham Altitude displayed on your PC will start going backwards. This is nor-
mal because the EGPWS does not use Gillham Code line D4. At altitudes
above 18,000 feet, the EGPWS uses GPS altitude for calculations.
T.
Start an ascent at 3,000 feet per minute while monitoring the item named
Gillham Alt ft. At approximately a 2-second rate the displayed altitude
should increase by 100 feet.
Make absolutely certain that the altitude always increases; never goes
backwards and never skips a 100 foot increment. You can record this test
using the data collection feature of WinViews.
This will allow you to look through the data after the test using a text editor.
This test verifies that the barometric altitude source is working correctly
and that the wiring is correct. Troubleshoot anomalies discovered during
this test.
Rev 3, August/2002
(the letter/number identifier of the closest airport Only
public airports with runways 2000 feet or longer)
The distance in nm to the reference point of the airport.
10609I03 CDL
KMH 880/KTA 870
Page 4-21
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