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Gear retract test

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cliff(at)gesoco.com
Guest

Posted: Thu Aug 02, 2007 7:27 am Post subject: Gear retract test

I don't want to stomp on any toes, so please don't take it that way.

I've seen and heard of too many people who are scared out of their wits 

about doing gear testing because they're afraid the plane will hop off 

the jacks.



If you're blasting the gear down, then you're doing it wrong and will 

damage the gear system.



Below is a generic version of the correct way to perform a gear 

retraction test for Yaks on jacks and the gear selector in the down 

position:



1) MAIN AIR- OPEN

2) SELECT GEAR- UP

3) VERIFY GEAR UP- CHECK UPLOCKS ETC

4) MAIN AIR - CLOSE

5) EMERGENCY AIR- OPEN QUICKLY

6) VERIFY GEAR UNLOCKS FROM THE UP POSITION

    The gear should be caught in between the up and down positions.

    This is a good time to look over the gear swing action by hand.

7) SELECT GEAR- NEUTRAL

 VERIFY GEAR DOWN AND LOCKED

9) EMERGENCY AIR- CLOSE

10) SELECT GEAR- DOWN

11) BLEED OFF SYSTEM PRESSURE FOR 2 MINUTES

I usually actuate the parking brake and alternate left and right rudder 

until the "fart" valve releases.

It's important to wait a good minute after the valve releases to ensure 

the emergency system is purged before engaging the main air system.

If there's any residual pressure in the emergency side the shuttle 

valves on the gear may not switch over completely to the main system.

12) MAIN AIR- OPEN

13) SELECT GEAR- UP

14) VERIFY GEAR UP

15) SELECT GEAR- DOWN

16) VERIFY GEAR DOWN AND LOCKED



With best regards to all,

Cliff



Tim Gagnon wrote:



 	  Quote: 	
		  



Be very careful with the retraction test. It is a bit unnerving. I have done it a few times and every time it scares the hell out of me. I do not like airplanes on jacks.





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