There has been a big conversation on the NBAA Maintenance email system on tire servicing. It started with this post:
One day last week the pilot on the aircraft attempted to service the nose tire with a fully charged nitrogen bottle. The pilot, who has an A&P certificate, was not familiar with the regulator on the bottle. Fortunately the pilot had hooked up a long hose to the inflation valve, he was standing by the bottle, a few feet from the wheel when it exploded.
The wheel spilt, one half impacting a hangar column, the other half impacted a GIII open main entrance door prior to being stopped by a closed hangar door 100 feet from the aircraft.
No one was injured…..I would have thought we all learned how to avoid this from happening years ago….
It was surely the luckiest day in that pilot’s life…
Lots of good follow-up discussion on regulators and relief valves.
Richard commented: Check out this website for tire servicing cages, the videos are very enlightening. http://www.alberthaviation.com/TireCageVideos.htm
Matt recommended the following:
We have a 250 PSI relief valve at the end of the nitrogen line for tire servicing.
In order to service bottles the line must be removed from the relief valve.
If the regulator was left in the full clockwise (high pressure) position and the main supply valve is opened, a rather loud aural warning will occur when the relief valve activates. This will then prompt the operator to adjust the regulator to a more civilized setting.
The relief valve serves as a safety net to prevent over servicing tires.
I checked the part number on relief valve, it is a Victor 0630-500.
Valve is described in this web link (good article by Boeing)
Roy added: The Falcon Operator Communique issued after this incident, basically states that based on reports, the person servicing the NLG tire tried to inflate it to 88 bars (1276 psi) instead of 88 psi (6 bars). Dassault strongly recommends that maintenance personnel carefully review the proper servicing instructions prior to inflating tires. This is basic and fundamentally sound advice!
What has your experiance suggested?