(18)
In turn position each wing anti-ice switch to ON and verify that CDU indicates that using anti-ice when outside air temperature is greater than +100C is invalid. Move switch back to OFF and verify display returns to normal.

(19)
Move CDU mode selector to CRZ and verify that ENGAGE light is illuminated. Press ENGAGE and verify that EPR and airspeed command bugs drive to CDU values.

(20)
Press TURB and verify that cruise turbulence data is displayed, mode annunciator indicates CRZ TURB, and on GJ ALL EXCEPT 2509 and 2510 airspeed command bug drives to CDU value. EPR command bugs drive to a corresponding N1 value.

(21)
Press TURB again and verify that display and command bug positions return to those in step (19).

(22)
Omega Interface Test

(a)  
Close the Omega navigation system AC and DC circuit breakers and set the OFF/A/M/R switch to A (Automatic).

(b)  
Rotate the Omega DSS selector to POS and, using the keyboard, enter latitude N500 00.0', longitude W120000.0'.

(c)  
Turn the Omega DSS selector to D/GMT. Enter the current date (month, day and Greenwich Mean Time).

(d)  
Set the Omega DSS selector to WPT, enter latitude N52000.0' and W120000.0'.

(e)  
Set Omega DSS selector to GS/DA.

(f)  
Connect the air pressure/vacuum sources to the airplane's pitot-static system.

(g)  
Slowly apply pressure to the pitot-static system and monitor the pressure increase on the MACH/IAS indicator until 200 knots is indicated and stable.

(h)  
Open landing gear lights circuit breaker.

(i)  
On Omega, press TK CHG, 0, 1, ENT.

(j)  
Rotate the PDC selector to STBY and press the "-" key. Page to test page 4-4 (6-6 on GJ B-2509 and B-2510) and verify that the values for ground speed on the PDC CDU and Omega CDU are identical.

NOTE:  Without Omega synched, a wandering of values may occur. This is not unusual.

(k)  
Rotate the Omega DSS selector to DIS/CRS and verify that both PDC and Omega display identical values of distance to waypoint.

(l)  
On the PDC CDU press WIND.

(m)  
Verify display reads UPDATE YES.

(n)  
Press RCL.

(o)  
Enter a wind value of 10. Press ENGAGE. Verify that CRZ is re-engaged (engage light off).

(p)  
Press WIND.

(q)  
Verify display reads UPDATE NO.

(r)  
Turn the Omega OFF/A/M/R switch to OFF.

(s)  
Verify that PDC CDU reads “. FAIL.”

(t)  
Open the Omega Nav circuit breaker.

(u)  
Close the Landing Gear Lights circuit breaker.

(23)  
Move mode selector through flight modes DES (descent), HOLD, CON (continuous) and GA (go-around). At each position, verify LOAD DATA or INVALID message is not displayed.

(24)  
Move mode selector to STBY and press minus (-). Verify that page 1 of TEST is displayed.

(25)  
Set decade resistance box to 382.6 ohms and verify that TAT display indicates -60oC.

Repeat for settings of 501.3 ohms (0oC) and 617.3 ohms (+60oC). CDU value of TAT should agree within 士2.5oC.

(26)  
Vary air data test set to establish 180, 270 and 340 knots on captain's mach airspeed indicator. Corresponding CDU values of IAS should agree within士1 knot. Do not reduce airspeed below 60 knots during test.

(27)  
Vary air data test set to establish 4000, 10,000, 25,000 and 40,000 feet on captain's altimeter. Corresponding CDU values of ALT should agree within 士100 feet.

(28)  
Refer to applicable steps of alternate procedure system test of 77-11-0, Engine Pressure Ratio Indicating System Adjustment/Test and simulate EPR of approximately 1.5 for engine No. 1.

(29)  
Verify CDU EPR No. 1 value is within 0.005 of value displayed on No. 1 EPR indicator.

(30)  
Repeat steps (28) and (29) for EPR indicator No. 2.

(31)  
Depress forward PAGE to obtain TEST page 2-3.

(32)  
Verify that FUEL WT displayed compares with total fuel quantity indicated within 2%.

(33)  
Tune No. 1 DME interrogator and verify DME indicator distance agrees with CDU DME-1 display within士1 mile.

(34)  
Tune No. 2 DME interrogator (if installed) and verify that DME indicator distance agrees with DME-2 display within士1 mile.

(35)  
Reduce indicated airspeed below 60 knots, and altitude to 0. Verify that after approximately 3 minutes LOAD page is displayed and manually loaded data has been replaced by question marks.

(36)  
Move mode selector from TO thru GA and verify LOAD DATA is displayed for each mode.

(37) 
 Disconnect test equipment.
　
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