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Gulfstream V Training Captain's Questions and Answers

 FlightSafety KSAV

ENGINE GROUND START

Why do we have to check that residual TGT is ‹ 150° C prior to Engine Start?

The FADEC will not allow an Engine Start if the TGT is › 150° C and will Issue an AUTOSTART ABORT command.

In a tail wind condition, why do we have to verify positive LP RPM prior to selecting the Fuel Control Switch to Run?

The FADEC will control an Automatic Ground Engine Start once the Fuel Control Switch is selected to RUN, protecting all Normal Engine Parameters. However, the FADEC can only sense LP RPM and can not tell the difference between Positive or Negative LP RPM. Therefore, if the LP RPM is in the Negative Range due to a Tail Wind, the FADEC will an Automatic Ground Start and possibly produce a Hot Start. In other word, the FADEC has the speed of lightening, but the brains of a Nat.

If the Engine has been started between 20 minutes and 5 hours, why do we have to Crank the Engine for 30 Seconds at MAX Cranking HP RPM prior to selecting the Fuel Control Switch to RUN?

Between the time frame mentioned above, residual heat from a recently run engine has no place to go and remains in the Engine Core. The residual heat from a recently run engine heats up the HP Shaft that is supported by 2 bearings. Since the HP shaft can not expand thermodynamically due to the 2 fixed positions of the support bearings, it will bow. If the Fuel Control Switch is selected to RUN, without allowing the HP Shaft to cool, the bowed HP Shaft will cause HP Rotors to Rub against the HP Core. This will eventually reduce the specific range of the engine and reduce the engine performance. Therefore, allowing the engine Crank at MAX HP Cranking RPM for 30 seconds, expels the residual heat, reduces the bow effect and engine vibration and prevents damage to the engine. "Bottom Line" is that the Procedure reduces Rotor Bow.

AFTER STARING ENGINES

If after starting both engine, you discover that the Right Pack is OFF and the Isolation Valve is OPEN, what is the most likely cause?

START MASTER is still ON

What would happen if the START MASTER Switch were left ON?

When the parking brake handle is released the BLEED CONFIG amber message will come on

If the APU BLEED AIR is not selected OFF prior to Takeoff, what will happen to the APU or ECS when the power levels are advanced for takeoff?

Nothing. The APU BLEED AIR and Isolation Valve will close when:

1. The Power Levers are advanced to @ 80% HP RPM,
2. The aircraft becomes Weight off Wheels.

What exactly are you checking when you perform the Ground Spoiler Test?

1. Ground Spoilers Switch Armed with Throttles at IDLE = Ground Spoilers Deploy
   • Check: Primary and Secondary Ground Spoiler Valves are Open and working Normally.
2. Advance one Throttle at a time = Ground Spoilers stow
   • Check: Throttle rigging (Micro switches within the throttle quadrant)
3. Deselect Ground Spoiler ARM Switch, Press Ground Spoiler TEST Switch =
   NO GROUND SPOILER lights on Center Post
   Red GROUND SPOILERS Message on CAS
   • Check: NO GROUND SPOILER lights Requesting Ground Spoiler,
     • Primary Valve is OPEN, Secondary Valve is Closed
   • Check: Red GROUND SPOILER Message on CAS, Primary Valve is OPEN
     • (Throttle Advanced) = A Mandatory ABORT if message comes on during Takeoff.

While performing the Stall Barrier Test, at what AOA do you expect the Stick Shaker and Stall Barrier to activate?

Stick Shaker will activate at AOA 0.85 followed ½ second later by the Stick Pusher which activates at AOA 1.0

In addition to disconnecting the Autopilot, what does the Autopilot Disconnect Button do if held pressed?

1. Releases the Electric Pitch Trim and stops Run-away electric trim.
2. Stops the Flaps / Stab from moving.
3. Deactivates the Stall Barrier and Stick Pusher.

You arrived late and elected not to check the engine oil 30 minutes after engine shutdown. The following morning, you arrive early to start the engines, and then shutdown to check the engine oil. During the procedure, you decide to complete some additional checks before the passengers arrive. However, you discover that the STALL BARRIER Test does not work properly. What is the most likely cause?

ANTI ICE HEATERS & PROBE HEATERS are still OFF. These switches are required to be ON for the system to operate normally.