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falconfixer860261 wrote:

CCAF wrote:

falconfixer860261 wrote:

CCAF wrote:

That_Engine_Guy wrote:

The "scavenge" or "rev up" at engine shut-down for the -200 and -220/-220E engines was to recover more oil from the engine's bearing cavities and pump it to the tank. At idle, oil would tend to gather in the bearing cavities. While not harmful to the engine, the oil would tend leak from the cavities after shut-down when the breather or "head-pressure" on the system was removed.

Close. The problem was actually that the scavenge system would actually create a vacuum in the bearing cavity. After shut down cool oil would siphon (hence anti-siphon tube) from the tank and fill the cavity with too much oil. And when the oil would heat up it would push the carbon seal open and the oil would leak.

You know JR?

I work for JR.

Go kick him in the butt and say his favorite homey from Indianapolis says hi.

Go kick him in the butt and say his favorite homey from Indianapolis says hi.

BTW - get back to work Sergeant and quit wasting gov't time messing around on personal business. Wink

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We have a saying around here, "Dont poke the bear." He stays holed up in his office until its time to kill something (or someone). He's gone this week but I'll tell him when he gets back.

CCAF wrote:

We have a saying around here, "Dont poke the bear." He stays holed up in his office until its time to kill something (or someone). He's gone this week but I'll tell him when he gets back.

Naaah. He's a teddy bear......

Newbie Joined: Jun 21, 2004 Posts: 5 Status: Offline

I suspect the F-16 gets a reasonable cool down anyway during approach, landing and taxi.
You have to be a bit more careful on jets with reverse thrust, where max thrust is used in reverse, some engines require around 3 mins of cooldown time after reverse thrust is used otherwise you can get oil cokeing.

Elite 1K Joined: Apr 26, 2004 Posts: 1191 Status: Offline

Oz you are 100% correct. After landing and taxi back it has cooled down, different story for high power ground runs, you must wait 5 min for cooling before shutdown.

Purple

No the engines do not have to be run at idle for any amout of time after landing. Reason being is based on what I write next...

If the engine has not been ran at Idle for 5 min after the engine has been run at a certan very high temp than It must be ran at Idle for 5 min or motored to cool after shut down.

After landing, taxi, park, the engine is already cool enough to shut down

Newbie Joined: Mar 22, 2007 Posts: 1 Status: Offline

VarkVet wrote:

Meathook wrote:

The hush house is a building where the aircraft is tied down so full operational checks including afterburner runs can take place...your welcome

Most of the times they are tied down.

Laughing

I know that guy, he just recently retired. That accident haunted him for the rest of his career(pretty much ruined his career, but he made it to TSgt). He's doing well up here though. Happily retired Smile

Elite 1K Joined: Jul 20, 2005 Posts: 1033 Status: Offline

Meathook wrote:

The hush house is a building where the aircraft is tied down so full operational checks including afterburner runs can take place...your welcome

More specifically...a hush house is where that takes place and its designed to lessen the amount of noise heard on base. Most bases have hush houses and outdoor areas for engine runs.

Check

Enthusiast Joined: Feb 13, 2007 Posts: 93 Status: Offline

I asked my next door neighbor who is an F-16 at Luke AFB for the 308TH fighter SQUAD. He told me that when they pull back into there parking space the ground crew checks the outside and the pilot dose checks of the A/C.

Elite 2K Joined: May 13, 2004 Posts: 2945 Location: Utah

Glad he is enjoying life these days (out of uniform), not the name any person would want to make or be known for while in uniform.

To add a little bit about the hush house......As was mentioed earlier, a hush house is a building designed for running jet engines up to 100% mil power and full burner. You can run the engine (already installed in a jet) or run an engine on a test stand. The hush house has slats or luvers built into the sides of the walls to allow airflow into the hush house. This is because as the egines runs up, it consumes enormous anounts of airflow.

Somewhat right about that block. The intake baffles are there to provide direct airflow to the engine. The are accurately angle to the engine to provied efficient airflow.

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