W DOC AIRBUS | AMM A320F

Mooring of Aircraft without Weight and Balance Provision on the Landing Gear Legs


TASK 10-20-00-556-001-A
Mooring of Aircraft without Weight and Balance Provision on the Landing Gear Legs


WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
CAUTION: THE LAST FEET OF ALL TAXIING AND TOWING OPERATIONS MUST BE IN A STRAIGHT LINE. THIS IS TO PREVENT FORCE ON THE TIRES AND THE MAIN LANDING GEAR.
1. Reason for the Job
The function of mooring is to prevent damage to the aircraft on the ground in high wind conditions.
This procedure is only applicable to aircraft without weight and balance provision on the landing gear legs.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
CHOCK - WHEEL(S)
No specific
12
GROUND MASTER RING (SEE TABLE)
No specific
6
JOKER HOOK (SEE TABLE)
No specific
6
ROUND SLING (SEE TABLE)
No specific
6
STEEL MASTER RING (SEE TABLE)
No specific
12
STEEL SHACKLE (SEE TABLE)
No specific
12
STRAP RATCHET (SEE TABLE)
 B. Referenced Information
REFERENCE
DESIGNATION
TASK 05-57-00-200-001-A
Aircraft Stability
TASK 05-57-00-200-001-B
Aircraft Stability
TASK 05-57-00-200-001-C
Aircraft Stability
TASK 10-10-00-550-801-A
Parking and Storage Procedure
TASK 10-11-00-555-015-A
Procedure for the Installation of Wheel Chocks on Aircraft
TASK 12-34-24-869-002-A
Aircraft Grounding (Earthing) for the Maintenance Operations
TASK 12-34-24-869-002-A-01
Aircraft Grounding (Earthing) during Transit, Turnaround or Overnight Stop
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
TASK 32-41-00-210-002-A
Inspection/Check of the Wheels and Tires
TASK 32-47-15-000-001-A
Removal of the Brake Temperature Sensor
TASK 32-47-15-400-001-A
Installation of the Brake Temperature Sensor
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 10-20-00-860-052-A
A. Aircraft Stability
   (1) The limits of aircraft stability in relation to the wind speed are given in the aircraft stability procedure, (Ref. AMM TASK 05-57-00-200-001).
Subtask 10-20-00-941-050-A
B. Weather Limits
   (1) Wind conditions
     (a) For wind speeds of less than 50 knots (92 km/h):
  • Mooring is not necessary.
     (b) If the wind speed is between 50 and 70 knots (92 and 129 km/h) and stable (no gusts and the wind direction does not change by more than +/- 30 degrees) and the aircraft points into the wind:
  • Moor the aircraft at the NLG only.
NOTE: If it is not possible to point the aircraft into the wind, see para (c).
     (c) If the wind speed is between 50 and 70 knots (92 and 129 km/h) and not stable, with the direction that changes by more than +/- 30 degrees:
  • Point the aircraft into the primary wind direction (if possible) and moor at the NLG and the MLG.
     (d) If the wind speed is between 70 knots (129 km/h) and the maximum limits given in:
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
  • Make sure that the aircraft weight is sufficient for the necessary wind speed.
  • Point the aircraft into the primary wind direction (if possible) and moor at the NLG and MLG.
NOTE: If you cannot get the necessary aircraft weight, you must move the aircraft into a hangar.
     (e) If the wind speed is more than the maximum limits given in:
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
  • You must move the aircraft into a hangar.
   (2) Icing condition limits in high wind conditions (wind speed of 50 knots (92 km/h) or more):
     (a) For a temperature of less than -5 deg.C (23.00 deg.F):
  • Move the aircraft into a hangar.
     (b) For a temperature of more than -5 deg.C (23.00 deg.F):
  • If there is ice or if ice is possible, Airbus recommends that you put salt around and below the tires.
  • If there is thick ice or compacted snow, remove the ice or snow, or move the aircraft into a hangar.
Subtask 10-20-00-860-050-A
C. Aircraft Maintenance Configuration
   (1) Put the aircraft in position on a flat surface with the mooring points.
Make sure that the wheels of the NLG are on the aircraft axis and that the aircraft points into the wind.
Make sure that the GROUND MASTER RING (SEE TABLE) are in the ground-master-ring position area.
   (2) Make sure that the landing-gear safety devices are in position (Ref. AMM TASK 32-00-00-481-001).
   (3) Electrically ground the aircraft (Ref. AMM TASK 12-34-24-869-002).
   (4) Put the CHOCK - WHEEL(S) in position (Ref. AMM TASK 10-11-00-555-015).
   (5) Make sure that the flaps, the slats, the spoilers, the speed brakes and the thrust reversers are retracted.
   (6) Make sure that the Trimmable Horizontal Stabilizer (THS) is set to neutral.
   (7) Make sure that the sliding windows of the cockpit are closed.
   (8) Make sure that the passenger/crew doors and the cargo compartment doors are closed.
   (9) Put the aircraft in the parking configuration for not more than 1 month in relation to the weather conditions (Ref. AMM TASK 10-10-00-550-801).
   (10) Make sure that the aircraft weight is sufficient for the possible wind speed.
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
F Mooring Wind Speed Limits ** ON A/C NOT FOR ALL
   (11) Remove the brake temperature sensors and cables (Ref. AMM TASK 32-47-15-000-001).
4. Procedure
Subtask 10-20-00-481-050-A
A. Mooring of the NLG
   (1) With the mooring items that follow:
DESCRIPTION
ITEM
QUANTITY
LENGTH
MIN ULTIMATE FAILURE LOAD
ROUND SLING (SEE TABLE)
1
2
2000 mm (78.74 in.)
12945 daN (29102 lbf)
JOKER HOOK (SEE TABLE)
2
2
/
24271 daN (54563 lbf)
STRAP RATCHET (SEE TABLE)
- Lashing-strap
- Ratchet mechanism
4 and 7
4
as necessary
9807 daN (22047 lbf)
STEEL SHACKLE (SEE TABLE)
5
4
/
7845 daN (17636 lbf)
STEEL MASTER RING (SEE TABLE)
3
2
/
24271 daN (54563 lbf)
GROUND MASTER RING (SEE TABLE)
6
4
/
15691 daN (35275 lbf)
NOTE: The manufacturer of the mooring equipment (shown in the table above) can possibly also supply a minimum ultimate failure-load or a safe working load with a safety factor for the equipment.
The minimum ultimate failure-load is the load at which equipment failure will occur. The safe working load is lower than the minimum ultimate failure-load. To calculate the safe working load, you must use a special safety factor applicable for the initial function of the equipment.
If a safe working load is shown on the equipment, you can multiply this load by the safety factor given by the manufacturer to get the minimum ultimate failure-load of the equipment.
You must then make sure that the calculated minimum ultimate failure-load is equal to or more than the value given in the table above for the related equipment.
Here is an example:
The ROUND SLING (SEE TABLE) (1) has a safe working load of 5000 daN (11240 lbf).
A safety factor of 7 is given by the manufacturer.
Minimum ultimate failure-load = 5000 daN x 7 = 35000 daN (78683 lbf).
The minimum permitted failure-load of the ROUND SLING (SEE TABLE) (1) for this configuration (as shown in the above table) is 12945 daN (29102 lbf). The equipment is thus serviceable.
NOTE: The ROUND SLING (SEE TABLE) are continuous loops. The ROUND SLING (SEE TABLE) minimum failure load relates to its load as a single loop.
NOTE: It is not necessary to use the STEEL SHACKLE (SEE TABLE) (5) in the system. If you do not use the STEEL SHACKLE (SEE TABLE) (5), use the ratchet mechanism (7) of the STRAP RATCHET (SEE TABLE) to attach the two ends of the lashing-strap (4) together. But we recommend that you use the STEEL SHACKLE (SEE TABLE) (5) to make installation easier.
     (a) Wind two ROUND SLING (SEE TABLE) (1) around the NLG sliding tube and below the axles.
     (b) Pull each ROUND SLING (SEE TABLE) (1) to a point that is in line with the centerline of the sliding tube (make sure that each section of the ROUND SLING (SEE TABLE) is of equal length). Then attach them to the JOKER HOOK (SEE TABLE) (2).
     (c) Attach the JOKER HOOK (SEE TABLE) (2) to the STEEL MASTER RING (SEE TABLE) (3).
     (d) Get one lashing-strap (4) of the STRAP RATCHET (SEE TABLE) and put one of its ends through the GROUND MASTER RING (SEE TABLE) (6).
     (e) Put other end of the lashing-strap (4) of the STRAP RATCHET (SEE TABLE) through the STEEL MASTER RING (SEE TABLE) (3). Move the two loose ends of the lashing-strap (4) of the STRAP RATCHET (SEE TABLE) to a point in the middle between the GROUND MASTER RING (SEE TABLE) (6) and the STEEL MASTER RING (SEE TABLE) (3).
     (f) Connect the two ends of the lashing-strap (4) of the STRAP RATCHET (SEE TABLE) together with the STEEL SHACKLE (SEE TABLE) (5).
     (g) Do steps (d) thru (f) again for each ground-master-ring position.
     (h) Use the ratchet mechanism (7) of the STRAP RATCHET (SEE TABLE) (to lightly pull each lashing-strap (4) so that it is not loose. Make sure that the last lateral position of the STEEL MASTER RING (SEE TABLE) (3) is in the axis of the centerline of the sliding tube.
NOTE: The function of the ratchet mechanism (7) of the STRAP RATCHET (SEE TABLE) is to make sure that the lashing-straps (4) are not loose but not to put tension in the system.
     (i) Make sure that the lashing-strap axes of the STRAP RATCHET (SEE TABLE) are in the ground-master-ring position area.
   (2) Post Mooring Inspection
Because wind speed is not constant or predictable, it is necessary to examine the landing gear for damage. This is to prevent the possible effects of too much wind speed and thus a possible landing gear overload. Because of this, you must do the inspections that follow after the mooring configuration is removed (when high winds stop).
     (a) Do a visual inspection of interfaces of the ROUND SLING (SEE TABLE) (1) on the sliding tube and axle for signs of damage to the landing-gear surface finish (chrome detachment, scratches or flaking paint).
     (b) Do a check of the tires for flat spots and signs of increased wear (Ref. AMM TASK 32-41-00-210-002).
     (c) Do an inspection of the NLG/fuselage attachments and make sure that:
  • There are no cracks.
  • There is no damage to the paint and sealant.
Subtask 10-20-00-481-052-A
B. Mooring of the MLG
   (1) With the mooring items that follow:
DESCRIPTION
ITEM
QUANTITY
LENGTH
MIN ULTIMATE FAILURE LOAD
ROUND SLING (SEE TABLE)
1
4
2000 mm (78.74 in.)
12945 daN (29102 lbf)
JOKER HOOK (SEE TABLE)
2
4
/
24271 daN (54563 lbf)
STRAP RATCHET (SEE TABLE)
- Lashing-strap
- Ratchet mechanism
4 and 7
8
as necessary
9807 daN (22047 lbf)
STEEL SHACKLE (SEE TABLE)
5
8
/
7845 daN (17636 lbf)
STEEL MASTER RING (SEE TABLE)
3
4
/
24271 daN (54563 lbf)
GROUND MASTER RING (SEE TABLE)
6
8
/
15691 daN (35275 lbf)
NOTE: The manufacturer of the mooring equipment (shown in the table above) can possibly also supply a minimum ultimate failure-load or a safe working load with a safety factor for the equipment.
The minimum ultimate failure-load is the load at which equipment failure will occur. The safe working load is lower than the minimum ultimate failure-load. To calculate the safe working load, you must use a special safety factor applicable for the initial function of the equipment.
If a safe working load is shown on the equipment, you can multiply this load by the safety factor given by the manufacturer to get the minimum ultimate failure-load of the equipment.
You must then make sure that the calculated minimum ultimate failure-load is equal to or more than the value given in the table above for the related equipment.
Here is an example:
The ROUND SLING (SEE TABLE) (1) has a safe working load of 5000 daN (11240 lbf).
A safety factor of 7 is given by the manufacturer.
Minimum ultimate failure-load = 5000 daN x 7 = 35000 daN (78683 lbf).
The minimum permitted failure-load of the ROUND SLING (SEE TABLE) (1) for this configuration (as shown in the above table) is 12945 daN (29102 lbf). The equipment is thus serviceable.
NOTE: The ROUND SLING (SEE TABLE) are continuous loops. The ROUND SLING (SEE TABLE) minimum failure load relates to its load as a single loop.
NOTE: It is not necessary to use the STEEL SHACKLE (SEE TABLE) (5) in the system. If you do not use the STEEL SHACKLE (SEE TABLE) (5), use the ratchet mechanism (7) of the STRAP RATCHET (SEE TABLE) to attach the two ends of the lashing-strap (4) together. But we recommend that you use the STEEL SHACKLE (SEE TABLE) (5) to make installation easier.
     (a) Wind two ROUND SLING (SEE TABLE) (1) around the left MLG sliding tube and below the axles.
     (b) Pull each ROUND SLING (SEE TABLE) (1) to a point that is in line with the centerline of the sliding tube (make sure that each section of the ROUND SLING (SEE TABLE) is of equal length). Then attach them to the JOKER HOOK (SEE TABLE) (2).
     (c) Attach the JOKER HOOK (SEE TABLE) (2) to the STEEL MASTER RING (SEE TABLE) (3).
     (d) Get one lashing-strap (4) of the STRAP RATCHET (SEE TABLE) and put one of its ends through the GROUND MASTER RING (SEE TABLE) (6).
     (e) Put other end of the lashing-strap (4) of the STRAP RATCHET (SEE TABLE) through the STEEL MASTER RING (SEE TABLE) (3). Move the two loose ends of the lashing-strap (4) of the STRAP RATCHET (SEE TABLE) to a point in the middle between the GROUND MASTER RING (SEE TABLE) (6) and the STEEL MASTER RING (SEE TABLE) (3).
     (f) Connect the two ends of the lashing-strap (4) of the STRAP RATCHET (SEE TABLE) together with the STEEL SHACKLE (SEE TABLE) (5).
     (g) Do steps (d) thru (f) again for each ground-master-ring position.
     (h) Use the ratchet mechanism (7) of the STRAP RATCHET (SEE TABLE) to lightly pull each lashing-strap (4) so that it is not loose. Make sure that the last lateral position of the STEEL MASTER RING (SEE TABLE) (3) is in the axis of the centerline of the sliding tube.
NOTE: The function of the ratchet mechanism (7) of the STRAP RATCHET (SEE TABLE) is to make sure that the lashing-straps (4) are not loose but not to put tension in the system.
     (i) Do steps (a) thru (h) again for the right MLG.
     (j) Make sure that the latching-strap axes of the STRAP RATCHET (SEE TABLE) are in the ground-master-ring position area.
.
   (2) Post Mooring Inspection
Because wind speed is not constant or predictable, it is necessary to examine the landing gear for damage. This is to prevent the possible effects of too much wind speed and thus a possible landing gear overload. Because of this, you must do the inspections that follow after the mooring configuration is removed (when high winds stop).
     (a) Do a visual inspection of interfaces of the ROUND SLING (SEE TABLE) (1) on the sliding tube and axle for signs of damage to the landing-gear surface finish (chrome detachment, scratches or flaking paint).
     (b) Do a check of the tires for flat spots and signs of increased wear (Ref. AMM TASK 32-41-00-210-002).
     (c) If there was possible interference between the ROUND SLING (SEE TABLE) (1) and the MLG dressings, do a detailed visual inspection of the MLG dressings and attachments for signs of damage/wear.
     (d) Do an inspection of the brake piston housing for signs of damage to the surface finish (wear, flaking paint).
     (e) Do an inspection of the MLG/wing attachments and make sure that:
  • There are no cracks.
  • There is no damage to the paint and sealant.
     (f) If you find damage during inspections, replace or repair the damaged component (refer to the applicable manuals SRM, AMM, CMM) and make sure that the adjacent area has no damage.
5. Close-up
Subtask 10-20-00-942-050-A
A. Put the aircraft back to its initial configuration.
   (1) After removal of the mooring equipment, install the brake temperature sensors and cables (Ref. AMM TASK 32-47-15-400-001).
   (2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
   (3) Make sure that the work area is clean and clear of tools and other items.
[Rev.10 from 2021] 2026.03.31 22:53:24 UTC