56-101-01175 Revision P Page | 51
4. Set the aircraft altimeter baro setting to 29.92 inHg (1013.25 mbar).
5. View and select the appropriate Limits on the DPS1000 for the Aircraft / Instruments to
be tested.
6. If necessary, (from the Main Menu) select Display Setup to configure display for the
Aeronautical display parameters required.
7. If necessary, (from the Main Menu) select Units to configure the display for the Units
required.
B.
Leak Testing
- Combined ALT & CAS
(using traditional Leak Rate Timer)
1.
If the display indicates “Leak Measure,” select the CONTROL key to toggle the Test
Set into the CONTROL mode.
2. Select CAS touch zone, the keypad
screen will be displayed with the “CAS = kts”
parameter indicated in the user entry window.
3. Enter the desired
CAS “Airspeed” value (for example, 300) and touch ENTER.
4. The Test Set and aircraft will begin moving towards the airspeed entered.
5. If a different ROC rate is required, select ROC touch zone, the keypad screen will be
displayed with the “ROC = ft” parameter indicated.
6.
Enter the desired ROC “Vertical Speed.”
7. Touch ALT zone. A keypad screen appears. Input the desired altitude value required
for the leak test altitude. Touch “Enter.”
8. The Test Set and aircraft / instruments will begin moving towards this altitude at the
VSI rate entered.
9. Allow Test Set to stabilize at Target values for a minimum of 10 seconds before
selecting Leak Measure mode.
10. In Leak Measure mode, select Leak Testing from the main menu.
11. Select Leak Rate Timer.
12. If required, set the Wait time and Leak time to the values required.
Note
: The default values are (Wait=1:00) minute and (Leak=1:00 minute) for CAS
airspeed and low altitude (typ < 10,000 ft). For High ALT (typ > 10,000 ft)
additional wait time is recommended (Wait=5:00) or more may be required to
allow the adiabatic to settle so the leak measurement will represent the actual
leak rate.
Note
: The Test Set can conduct a combined Static (Ps) and Pitot (Pt) test (as
described above) or individual system leak tests. To accomplish a single
channel (Pitot (Pt) only or Static (Ps) only) modify the procedures by simply not
entering Target value for the parameter / channel. For example, for Pt only Leak
check, the ALT target would remain at ambient Ground pressure altitude while
the CAS Target would be set at the desired CAS airspeed value.
In this example, if the Test Set Static (Ps) channel is not already at ambient
“Ground” pressure, perform a “Go To Ground” function first, then set CAS
Target to desired airspeed.
13. If additional Leak Test at other altitudes or airspeeds is required, repeat steps B.1
–
B.12 from this section for any additional test points.