TIRES AND WHEELS - INSPECTION/CHECK
1. General
A. This section provides procedures for inspection and check of landing gear tires and wheels while installed on airplane. Inspection procedures with wheel removed are provided in applicable wheel vendor manual.
2. Examine Main and Nose Landing Gear Wheels.
A. Examine wheels for cracks, flaked paint and evidence of overheating. Check dust caps for loose attach bolts.
B. Check wheels for missing tie bolt nuts. If tie bolt is missing, remove wheel. Inspect wheel assembly and replace tie bolt using procedures in applicable wheel vendor manual.
C. Inspect Wheel Halves
(1)
Check for abnormally tilted wheel and for missing pieces of flange.
(2)
Check for any areas on the wheel which show significant impact damage.
D. Examine thermal fuse on main gear wheels
(1)
If inspection shows that a pressure loss was due to the melting of the wheel thermal fuse, the tire should be removed from service. Also, all other main gear tire-wheels should be checked for melted thermal fuses, especially at the tire-wheel positions with hot brakes.
(2)
If a tire has been rolled flat, or if the tire-wheel has been removed due to melted wheel thermal fuse, the removal reason should be tagged to the wheel, and the wheel should be inspected in accordance with the wheel vendor's service instructions.
3. Check That Tire Pressure is Within Specified Limits (Ref. 12-15-51)
A. If a tire has been rolled flat, or has been judged to have rolled at 30% or more under specified pressure, both tires on that axle should be removed from service. If it is evident that pressure loss took place after the airplane was parked and no rolling took place, remove the tire with the low pressure. Drop in tire pressure may be due to one or more of the following reasons:
(1)
Decrease in ambient temperature after filling tire.
(2)
Dry or faulty O-ring seal between wheel halves.
(3)
Leaks through defective thermal plug seals.
(4)
Leaks at the tirebead seat.
(5)
Leaks through vent holes in tire sidewall.
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4. Examine Tires
A. Examine tires for air leakage, abrasion, uneven wear, cuts and flat spots. Remove from service tires exhibiting the following conditions.
(1)
Cuts or weather checks in grooves, tread or sidewalls which reach cord body (Fig. 602, Sheet 1, 2, 3).
(2)
Blisters, bulges or other evidence of ply separation in tread or sidewall area (Fig. 602, Sheet 7).
(3)
Any tire with a flat spot through the reinforcing cords at the tread -undertread interface (Fig. 602, Sheet 6).
NOTE: If the cut protector (radial) or tread reinforcement ply (bias) shows, the tire may be used without safety concerns. However, you may not be able to re-tread the tire if you leave the tire in service too long with this condition.
(4)
Other damage or combination of items which might result in tire problems.
B. Examine tires for wear.
(1)
When the average tread depth is reduced to 1/32 inch, remove tire from service. On center groove tire, measure at center groove. On center rib tire, measure at grooves nearest center.
(2)
When shoulder tread wears below bottom of groove, fabric is showing or blisters/cracks are found in bottom of groove, remove tire from service (Fig. 602, Sheet 8).
C. Tread Conditions and Service
(1) Cuts
(a)
Transverse Cuts (Fig. 602, Sheet 1) 1) Shallow cuts and puncture type cuts that are contained within a rib, less than 1 inch in length and have not exposed carcass plies may be left in service.
2) Remove from service if cut is deeper than tread groove and extends across a rib from groove to groove.
(b)
Circumferential cuts (Fig. 602, Sheet 1)
1) Cuts deeper than tread groove, but not into the carcass plies, with the ends not more than 1/2 inch apart measured transversal and 2 inches in length may continue in service.
2) If only one rib is involved, a cut less than groove depth up to 12 inches in length may be left in service if the ends of cut is not more than 1/2 inch apart measured transversely.
(2)
Open tread splice (Fig. 602, Sheet 4)
(a) Remove from service if separation exists.
(3)
Skid burns, ice burns, flat spots (Fig. 602, Sheet 6)
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