1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

AIRCRAFT REVISION TAIL NUMBER -

CUSTOMIZATION DOCTYPES TITLE
TYPES DATE MSN
ATR-A-32-41-XX-00001-360A-
Line 01-Jan-
1629 ATR72 A - Check of the Wheels and
Maintenance 2023
Tires

DM status information

DM Code : ATR-A-32-41-XX-00001-360A-A
Airline : 1629
Issue Number : 005
Issue Date : Aug 01/22
Breakdown Title : WHEELS AND TIRES
DM Title : Check of the Wheels and Tires
Applicability : ON A/C MSN ALL
Aircraft Type : ATR72
DM Producer : FB429
Language : Simplified English
Copyright : ATR-A-00-65-XX-10000-021A-D

ON A/C MSN ALL

TASK ATR-A-32-41-XX-00001-360A-A
Check of the Wheels and Tires
1. General
A. Reason for the Job
Self Explanatory
B. Additional information
Inflation:
The aircraft tires must be kept at their correct inflation pressure. The problems caused by
under inflation and over inflation can be particularly severe:
- Under inflation produces uneven tread wear, shortens tire life because of excessive
flex heating, allows tube-type tires to slip around the rim and shear off valve stems.
- Over inflation causes uneven tread wear, reduces traction, increases tire growth, and
makes treads more susceptible to cutting.
- When tires are subjected to ground temperature changes exceeding 27.5 deg.C (81.5
deg.F) because of flight to a different climate, inflation pressure should be adjusted
for the coldest climate prior to takeoff. An ambient temperature decrease of 2.75
deg.C (36.95 deg.F) should be compensated by one percent pressure increase.

2. Job Set-Up Information

A. Work Zones.

ZONE ZONE DESCRIPTION

711 NOSE LANDING GEAR LEG
731 LH MAIN LANDING GEAR LEG

about:blank 1/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

ZONE ZONE DESCRIPTION

741 RH MAIN LANDING GEAR LEG

B. Fixtures, Tools, Test and Support Equipment.

REFERENCE QTY DESIGNATION

GAUGE - PRESSURE
No Specific 1

C. Referenced Information.

REFERENCE DESIGNATION
CMM 324234 (0B9R9)
CMM 324291 (K1037)
CMM 324292 (K1037)
CMM 324942 (F6137)
CMM 324943 (F6137)
ATR-A-05-51-32-00ZZZ- MP - Unscheduled Inspection after Brake Overheat
282Z-A Indication or Melted Wheel Fuse-Plug
ATR-A-12-14-32-00ZZZ-
MP - Filling the Tire with Nitrogen
210Z-A

3. Job Set-Up
SUBTASK 3241XX-10100070001
A. During the inspection of the MLG or NLG tire pressures, do a visual inspection of the wheels
for integrity, correct alignment and make sure that there is no unusual camber and toe
angles.

4. Procedure
SUBTASK 3241XX-60000090002
Ref. Fig. Check of the NLG Tires
A. Check of the Tire Pressure
Ref. Fig. Check of the MLG Tires
Ref. Fig. Landing Gear Wheel Inflating Pressure - ATR 72
(1) Do the check of the tire pressure with the aircraft on its wheels.

NOTE: We recommend you to do a check of the tire pressure when the temperature
of the tire decreases to ambient temperature or after a minimum of three
hours from the last operation. Pressure check procedure for the hot tire must
be used only when necessary.

(2) Remove the inflation valve cap (2).

(3) If it is necessary to do the check of the tire pressure in cold weather (temperature
less than 3 deg.C (37.4 deg.F)), always apply the heat to the inflation valve assembly
(1) and the adjacent areas before removal of the inflation valve seal.
(4) Connect the GAUGE - PRESSURE (3) to the inflation valve assembly (1). If necessary,
use the valve extension.
(5) Read the pressure and make sure that the value is in limits:
(a) Cold-tire pressure check:

Measured Pressure as percentage ACTION

of Operating Pressure
Normal operating pressure: 105 to Do not adjust the tire pressure.
100 percent

about:blank 2/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

Measured Pressure as percentage ACTION

of Operating Pressure
100 to 95 percent Inflate the tire again to the specified
operating pressure.
95 to 90 percent Inflate the tire again to the specified
operating pressure and record it on
the aircraft logbook.
After 24 hours, if the pressure loss is
more than the daily permitted-
pressure loss (daily permitted-
pressure loss is equal to or less than
5 percent of the operating pressure),
remove the tire/wheel assembly and
send it to an approved repair facility
to examine.
90 to 80 percent Remove the tire/wheel assembly that
has a leak and send it to an approved
repair facility to examine.
Less than 80 percent Remove the tire/wheel assembly that
has a leak and the adjacent one.
Replace the tire/wheel assembly and
send the replaced tire/wheel assembly
to an approved repair facility to
examine.
0 percent Remove the tire/wheel assembly and
the adjacent one and send it to an
approved repair facility to examine. If
pressure loss occurred while rolling,
discard the tires.

Table - Cold tire pressure

1 If the pressure loss is because of wheel-fuse plug melting, do an
inspection Ref. MP ATR-A-05-51-32-00ZZZ-282Z-A.
2 After a flight, let the temperature of the tire decrease for a minimum of 2
to 3 hours before you do a cold-tire pressure check.
3 Tires become hot during operation (because of friction and brake
operation) and their pressure increases. If a hot tire is kept on aircraft for
continued operation, its pressure must not be decreased because this
could cause under inflation of the tire when cold.

(b) Hot-tire pressure check:

1 Do a check for the conditions that follow:
a All tire pressures are between 100 and 150 percent of the nominal
pressure.
b Pressures of the tires in the NLG are in 0.34 bar (5 psi) of each
other.
c Pressures of the tires in the same MLG are in 0.34 bar (5 psi) of
each other.
d Pressures of the tires in the different MLG are in 1.03 bar (15 psi) of
each other.

2 If all the above conditions are satisfactory in each landing gear:

a Adjust the lowest pressure of the two wheels to the highest pressure
of the two wheels.
b Do a cold-tire pressure check for all the tires again after two days.

3 If one of the above conditions is unsatisfactory:

about:blank 3/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

a Decrease the temperature of the tires.

b Do a cold-tire pressure check for all the tires.

(6) Disconnect the GAUGE - PRESSURE (3) from the inflation valve assembly (1).
(7) Do a leak test of the inflation valve assembly (1) as follows:
(a) Apply the leak detection fluid to the inflation valve assembly (1).
1 NOTE: Leak detection fluid can be a mixture of an aqueous cleaner and
water.

(b) Examine the inflation valve assembly (1) for bubbles.

(c) If the bubbles continue to show, joggle the valve to move the inflation valve
assembly (1) to a correct or good installation position.
(d) If the bubbles continue to show, do the task as given in the applicable CMM that
follows:

NLG Part Number (P/N) Family CMM Applicable

AH54452 Ref. CMM 324291 (K1037)
AH54474
C20589000 Ref. CMM 324943 (F6137)

Table - NLG CMMs

MLG P/N Family CMM Applicable

C20586100 Ref. CMM 324942 (F6137)
C20586110
C20586120
C20586101
AHA1890 Ref. CMM 324292 (K1037)
AHA1752
90010200 Ref. CMM 324234 (0B9R9)

Table - MLG CMMs

(8) Install the inflation valve cap (2).

SUBTASK 3241XX-60000100001
B. Servicing/Check of the Tire Wear (Utilization Limits)
(1) Tire installed on the aircraft must be examined to make sure its applicability for
continued trouble-free operation.
(2) Whenever a tire is removed, examine the interior and bead area.
(3) Conditions of the tires wear limit:
(a) Cuts, cracks, bulges, etc. must be marked with a crayon or chalk before
deflation.

NOTE: Cuts, cracks, bulges, etc. may be readily visible on an inflated tire, can
be difficult to relocate on a deflated one.

(4) When a tire is returned to the retreader, find the cause for removal of the tire.
(5) Do the procedures that follow, if you get the results with the above checks:
(a) The tire stay in service.
(b) The tire goes back to service after minor repair with the user.
(c) The tire must be removed and sent to the retreader, who will decide if or not it
may be repaired.
about:blank 4/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

(d) If necessary, replace the tire.

(6) Deterioration property and applicable procedures are given in the figures that follow:
- Ref. Fig. Tire Deterioration (Part-1)
- Ref. Fig. Tire Deterioration (Part-2)
- Ref. Fig. Tire Deterioration (Part-3)
- Ref. Fig. Tire Deterioration (Part-4)
- Ref. Fig. Tire Deterioration (Part-5).

(7) It is recommended to remove the tire from A/C when it is worn to bottom of any
groove at any location.

NOTE: Beyond this limit and if the top/first fabric/ply layer is not worn through or
exposed for more than 1/8 of the circumference of the tire and not more
than 25.4 mm (1.00 in.) wide, then the tire can remain in service no longer
than the time necessary to return to the base and be replaced.

SUBTASK 3241XX-60000110001
C. Fill the tire with nitrogen Ref. MP ATR-A-12-14-32-00ZZZ-210Z-A.

5. Close-Up
SUBTASK 3241XX-10200070001
A. Close Up
(1) Remove all the fixtures, tools, test and support equipment used during this
procedure.
(2) Make sure that the work area is clean and clear of tools and other items.

Figure ICN-ATR-A-324100-A-FB429-00TUY-A-003-01 SHEET 1/1 - Check of the NLG Tires

Figure ICN-ATR-A-324100-A-FB429-00TUZ-A-003-01 SHEET 1/1 - Check of the MLG Tires

Figure ICN-ATR-A-324100-A-FB429-00TW6-A-002-01 SHEET 1/1 - Landing Gear Wheel Inflating

Pressure - ATR 72

Figure ICN-ATR-A-324100-A-FB429-00TW7-A-002-01 SHEET 1/1 - Tire Deterioration (Part-1)

Figure ICN-ATR-A-324100-A-FB429-00TW8-A-002-01 SHEET 1/1 - Tire Deterioration (Part-2)

Figure ICN-ATR-A-324100-A-FB429-00TW9-A-003-01 SHEET 1/1 - Tire Deterioration (Part-3)

Figure ICN-ATR-A-324100-A-FB429-00TWA-A-002-01 SHEET 1/1 - Tire Deterioration (Part-4)

Figure ICN-ATR-A-324100-A-FB429-00TWB-A-002-01 SHEET 1/1 - Tire Deterioration (Part-5)

about:blank 5/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

Z711

B
A

1 2

B
LH SHOWN
RH SYMMETRICAL
ICN-ATR-A-324100-A-FB429-00TUY-A-003-01

Figure ICN-ATR-A-324100-A-FB429-00TUY-A-003-01 (SHEET 1) - Check of the NLG Tires

about:blank 6/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

Z731

Z741 B
A

B
A
LH SHOWN
RH SYMMETRICAL

2
1

B
TYPICAL
ICN-ATR-A-324100-A-FB429-00TUZ-A-003-01

Figure ICN-ATR-A-324100-A-FB429-00TUZ-A-003-01 (SHEET 1) - Check of the MLG Tires

about:blank 7/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

ATR 72 MAIN WHEEL TYRES BIAS NOSE WHEEL TYRES RADIAL NOSE WHEEL TYRES
MODELS MTOW INFLATING PRESSURE INFLATING PRESSURE INFLATING PRESSURE
CLASSIFICATION H34 x 10.0 R16 450 x 190-5 435 x 190 R5
(ALL AUTHORIZED P/Ns) (P/N 459M08-2 OR 026-545-0) (P/N M09601)

107 psi 60 psi

72-1XX (19990 kg) -
(7.4 bar) (4.1 bar)

114 psi 64 psi 73 psi

72-2XX (21500 kg)
(7.8 bar) (4.4 bar) (5 bar)

119 psi 64 psi 73 psi

72-2XX (22000 kg) (8.2 bar) (4.4 bar) (5 bar)

121 psi 64 psi 73 psi

72-2XX (22500 kg)
(8.3 bar) (4.4 bar) (5 bar)

121 psi 64 psi 73 psi

72-2XX (22800 kg)
(8.3 bar) (4.4 bar) (5 bar)

123 psi 64 psi 73 psi

72-2XX (23000 kg)
(8.5 bar) (4.4 bar) (5 bar)

ICN-ATR-A-324100-A-FB429-00TW6-A-002-01

Figure ICN-ATR-A-324100-A-FB429-00TW6-A-002-01 (SHEET 1) - Landing Gear Wheel Inflating

Pressure - ATR 72

about:blank 8/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

01
02

CUTS OPEN TREAD SPLICE

03

04

TREAD CHUNKING TREAD SEPARATION

NOTE:
01 PENETRATION BY A FOREIGN OBJECT. CUT WHICH EXTEND ACROSS MORE THAN 50% OF ANY
ONE RIB. REMOVE THE TIRE
02 AN OPENING OF THE BIASED TREAD SPLICE ACROSS ONE OR MORE TREAD RIBS.
REMOVE THE TIRE
03 A POCK MARK CONDITION IN THE WEARING PORTION OF TREAD. USUALLY DUE TO ROUGH OR
UNIMPROVED RUNWAYS. REMOVE IF FABRIC IS VISIBLE
04 A RATHER LARGE AREA OF SEPARATION OR VOID BETWEEN COMPONENTS IN THE TREAD
AREA DUE TO LOSS OF ADHESION. USUALLY CAUSED BY EXCESSIVE LOADS OR FLEX
HEATING FROM UNDERINFLATION. REMOVE IMMEDIATELY ICN-ATR-A-324100-A-FB429-00TW7-A-002-01

Figure ICN-ATR-A-324100-A-FB429-00TW7-A-002-01 (SHEET 1) - Tire Deterioration (Part-1)

about:blank 9/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

02
01

SKID TREAD RUBBER REVERSION

04

03

BLISTER CHEVRON CUTTING

NOTE:
01 AN OVAL-SHAPED FLAT SPOT OR SKID BURN IN THE TREAD WHICH MAY EXTEND TO OR INTO
FABRIC PLIES. REMOVE THE TIRE
02 AN OVAL-SHAPED AREA IN THE TREAD SIMILAR TO A SKID, BUT WHERE RUBBER SHOWS BURNING
DUE TO HYDROPLANING DURING LANDING USUALLY CAUSED BY WET OR ICE-COVERED RUNWAY.
REMOVE THE TIRE IF IT IS WORN TO THE BOTTOM OF ANY GROOVE AT ANY LOCATION OR IF THE
SEVERITY OF THE FLAT SPOT IS SUCH THAT IT IS CAUSING VIBRATIONS FELT BY THE CREW
03 A VOID WITHIN THE TREAD OR SIDEWALL RUBBER. REMOVE AND INSPECT
04 TREAD DAMAGE CAUSED BY RUNNING AND/OR BRAKING ON CROSS-GROOVED
RUNWAYS. REMOVE IF CHUNKING TO FABRIC OCCURS ICN-ATR-A-324100-A-FB429-00TW8-A-002-01

Figure ICN-ATR-A-324100-A-FB429-00TW8-A-002-01 (SHEET 1) - Tire Deterioration (Part-2)

about:blank 10/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

02
01

PEELED RIB THROWN TREAD

03 04
RIB UNDERCUTTING GROOVE CRACKING

NOTE:
01 USUALLY BEGINS WITH A CUT IN TREAD, RESULTING IN A CIRCUMFERENTIAL DELAMINATION
OF A TREAD RIB, PARTIALLY OR TOTALLY TO TREAD FABRIC PLY. REMOVE THE TIRE
02 PARTIAL OR COMPLETE LOSS OF TREAD DOWN TO TREAD FABRIC PLY, UNDER TREAD LAYER OR
CARCASS PLIES. REMOVE THE TIRE
03 AN EXTENSION OF GROOVE CRACKING PROGRESSING UNDER A TREAD RIB. REMOVE THE TIRE
04 A CIRCUMFERENTIAL CRACKING AT BASE OF A TREAD GROOVE REMOVE IF
FABRIC IS VISIBLE ICN-ATR-A-324100-A-FB429-00TW9-A-003-01

Figure ICN-ATR-A-324100-A-FB429-00TW9-A-003-01 (SHEET 1) - Tire Deterioration (Part-3)

about:blank 11/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

01
02

CUT OR SNAG OZONE OR WEATHER CHECKING/CRACKING

04

03

RADIAL OR CIRCUMFERENTIAL CRACKS SIDEWALL SEPARATION

NOTE:
01 PENETRATION BY A FOREIGN OBJECT ON RUNWAYS AND RAMPS. IN SHOPS, OR STORAGE AREAS
AREAS, REMOVE AND REPLACE IF INJURY EXTENDS INTO FABRIC
02 RANDOM PATTERN OF SHALLOW SIDEWALL CRACKS, USUALLY CAUSED BY AGE DETERIORATION,
PROLONGED EXPOSURE TO WEATHER OR IMPROPER STORAGE, REMOVE IF
FABRIC IS VISIBLE
03 CRACKING CONDITION FOUND IN THE SIDEWALL/SHOULDER AREA. REMOVE AND REPLACE IF
DOWN TO FABRIC
04 SIDEWALL RUBBER SEPARATED FROM THE CARCASS FABRIC. REMOVE IMMEDIATELY
ICN-ATR-A-324100-A-FB429-00TWA-A-002-01

Figure ICN-ATR-A-324100-A-FB429-00TWA-A-002-01 (SHEET 1) - Tire Deterioration (Part-4)

about:blank 12/13
1/18/23, 4:32 PM 1629 - ATR72 - Line Maintenance - 01-Jan-2023 - ATR-A-32-41-XX-00001-360A-A - Check of the Wheels and Tires

01

BRAKE HEAT DAMAGE KINKED BEAD

02

04
03

INNER TIRE BREAKDOWN IMPACT BREAK

NOTE:
01 A DETERIORATION OF THE BEAD TOE TO WHEEL FLANGE AREA. MINOR TO SEVERE BLISTERING
OF RUBBER IN THIS AREA. MELTED OR SOLIDFIED NYLON FABRIC IF TEMPERATURES
WHERE EXCESSIVE. VERY HARD, BRITTLE SURFACE RUBBER. TIRE IS TO BE SCRAPPED
02 AN OBVIOUS DEFORMATION OF THE BEAD WIRE IN THE BEAD TOE, FACE OR HEEL AREA, CAN
RESULT FROM IMPROPER MOUNTING OR DEMOUNTING AND/OR EXCESSIVE SPREADING
FOR INSPECTION PURPOSES. TIRE IS TO BE SCRAPPED
03 DETERIORATION (DISTORTED/WRINKLED RUBBER OF TUBELESS TIRE INNERLINER OR FABRIC
FRAYING/BREAKING OF TUBE-TYPE TIRES) IN THE SHOULDER AREA. USUALLY CAUSED BY
UNDERINFLATION OR OVERLOAD OPERATION. TIRE IS TO BE SCRAPPED
04 RUPTURE OF TIRE CARCASS IN TREAD OR SIDEWALL AREA. USUALLY FROM EXTREME HARD
LANDING OR PENETRATION BY FOREIGN OBJECT. THIS IS TO BE SCRAPPED
ICN-ATR-A-324100-A-FB429-00TWB-A-002-01

Figure ICN-ATR-A-324100-A-FB429-00TWB-A-002-01 (SHEET 1) - Tire Deterioration (Part-5)

© ATR ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.

about:blank 13/13