Comment 16 for bug 895230

GATECH is the required building

Case 1: VehicleType
-Works as expected. Unit is non-functional without GATECH present

Case 2: VehicleType, Helicopter
-If built when structure is missing: Unit destroyed immediately above the WF, spinning endlessly until building is sold. The unit is repeatedly "destroyed" when GATECH is disabled/enabled (with EVA announcement).
-If built when structure is present, but is then sold: Unit explodes immediately at location

Case 3: VehicleType, PoweredBy=GATECH,GAOREP
-Has no effect. Unit works with neither building present

Case 4: VehicleType, Naval=yes
-Works as expected. Ship is disabled (doesn't sink) until building is present.

Case 5: BuildingType, combination oil derrick, spy-sat, powerplant, Powered=yes
-Has no effect. Building still provides power, spy-satellite, and oil-derrick income.

Case 6: BuildingType, Base defense, Powered=yes
-Works as expected.

Case 7: InfantryType
-Is disabled when building is not present.

Case 8: AircraftType
-Cannot be box-selected; but can be click-selected like any other disabled unit
-When disabled, it WILL accept force-fire orders at TERRAIN WITHIN its weapon range, and take off from the airpad, but will just wildly fly around the target area without attacking
-If is powered in flight, and then loses the power source, it immediately crashes to the ground.

Case 9: VehicleType, Operator=SSIONTROOP
-When SSIONTROOP enters vehicle without GATECH present, it's non-functional.
-If GATECH is present, but SSIONTROOP isn't inside the vehicle, it's non-functional
-If both are present, it works.

EDIT- More indepth
Case 10: BuildingType, Superweapon LightningStorm (with modded recharge time)
-Building doesn't animate, but the SW still counts down and can be activated

Case 11: BuildingType, Any
-If built when unpowered, the build-up's first frame appears, but it then freezes. Even if power is restored, the build-up will not finish. Building still fulfills prerequisites. It can be sold in this state.

Case 12/13: BuildingType, Factory (Navy Yard), Refinery
-Doesn't animate, but still functions

Case 14: BuildingType, Base Defense, Powered=no
-Still animates, doesn't function

Case 15: VehicleType, Naval=yes, hovers
-Sinks immediately when produced. Sinks on water when structure is sold/power is lost.

Case 16: BuildingType, Repair Bay
-If the Repair Bay is PoweredBy=, the vehicles repairs will cease
-If the vehicle is PoweredBy= and the Rep bay isn't, vehicle will continue to repair, but won't move from the bay when it finishes
Running out of ideas, but in all it seems to work. Most importantly, all of these TechnoTypes were powered by the same building.