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Long Term Aircraft Storage Question  
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Posted (11 years 10 months 3 weeks 1 day 6 hours ago) and read 6506 times:

I read an article on long term storage of aircraft. One of the items to be completed on the storage checklist is to deflate the tires to 60% of their normal inflation pressure. Why is this done?

3 replies: All unread, jump to last
 
User currently offlineWhiskeyflyer From Ireland, joined May 2002, 224 posts, RR: 0
Reply 1, posted (11 years 10 months 2 weeks 4 days 23 hours ago) and read 6362 times:

Where did you read this? I am most interested. When we are placing aircraft in short term storage, we move the aircraft at least once every 4 days to avoid flat spots occuring on tires. For long term storage we jack aircraft off tyres (assuming you wish to use the tires again if they are serviceable). Decreasing tyre pressure would cause undue stress on tyre side walls, but if some new approved OEM technique out there I am interested

User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 2, posted (11 years 10 months 2 weeks 4 days 18 hours ago) and read 6348 times:

I read an article on long term storage of aircraft. One of the items to be completed on the storage checklist is to deflate the tires to 60% of their normal inflation pressure.

heres the Airbus calculation for storage tire pressure:

A300 AMM 10-10-30-00

2. Long Term Storage Period (0 to 2 Years)

CAUTION : IN SERVICE AIRCRAFT ARE SUBJECT OF MAINTENANCE PROGRAMS.
SUSPENSION OR VARIATION OF THESE PROGRAMS DURING STORAGE
MUST BE NEGOTIATED WITH THE LOCAL AIRWORTHINESS AUTHORITY.

The following procedures are recommended for a long term period
(0 to 2 years).


(6)Landing gear (Nose and Main Landing Gear)


(e)Wheels and brakes (all types)
- Install wheels and brakes on landing gear (Ref. 12-37-32 ,
P. Block 1 and 32-42-27, P. Block 401 ).
- Lubricate brake conponents (Ref. 12-22-32, P. Block 1 )
- Grease nose gear axles with Material No. 04-001.
- Install nose wheels.
- Protect brakes and tires with plastic covers (local manufacture).
CAUTION : PROVIDE SUFFICIENT VENTILATION TO AVOID CONDENSATION AND MOISTURE RETENTION.
NOTE : If salty atmosphere is present and if aircraft is stored with
engines inoperative, remove brakes and store.If aircraft has to be moved, reinstall the brakes before movingthe aircraft.
NOTE : Protection of brake discs (steel) is not necessary, as rusting
will disappear at the first braking operation.

- Check tire pressure with gage and mark position of tires with date
(Ref. 12-14-32, P. Block 1 ).
NOTE : For storage periods greater than 6 months, it is recommended to
install old tires (or wheels equipped with old tires) on the nose and main landing gears.


The tire inflation pressure for the storage will be adapted to
the stored A/C weight.


Tire inflation pressure will be calculated as follows :
Normal tire pressure
at max ramp weight, x stored A/C weight
Tire pressure A/C on ground
for storage = --------------------------------------------
A/C max ramp weight

Example : - Aircraft with 49 x 17 tires normally inflated at
187 psi. (pressure A/C on ground)
- A/C storage weight = 140 t with fuel


187 psi x 140
Tire pressure for storage = ------------- = 158 psi
165.9
- If aircraft is stored on an unprepared surface, isolate tires from
ground.
- Use chocks to immobilize wheels.



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineWhiskeyflyer From Ireland, joined May 2002, 224 posts, RR: 0
Reply 3, posted (11 years 10 months 2 weeks 4 days 2 hours ago) and read 6307 times:

NOTE : For storage periods greater than 6 months, it is recommended to
install old tires (or wheels equipped with old tires) on the nose and main landing gears.

That agrees with what I said (as you don't care what happens to old tyres)]

Example : - Aircraft with 49 x 17 tires normally inflated at
187 psi. (pressure A/C on ground)
- A/C storage weight = 140 t with fuel
187 psi x 140
Tire pressure for storage = ------------- = 158 psi
165.9

How did you get to 158psi?

A good site for tyre info is http://www.goodyear.com go to Aviation Tyres section, then Tech info and download the the info PDF file.


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