DOC AIRBUS | AMM A320FStorage of Flexible Rings, Hoses and Rubber Components [IAE]
TASK 70-23-13-550-020-A
Storage of Flexible Rings, Hoses and Rubber Components
1. Reason for the Job
This task gives data for the identification, storage and inspection of rubber and synthetic rubber components.
2. Job Set-up
Subtask 70-23-13-869-051-A ** ON A/C NOT FOR ALL
Subtask 70-23-13-550-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:19:36 UTC
Storage of Flexible Rings, Hoses and Rubber Components
1. Reason for the Job
This task gives data for the identification, storage and inspection of rubber and synthetic rubber components.
2. Job Set-up
Subtask 70-23-13-869-051-A ** ON A/C NOT FOR ALL
A. Not Applicable
3. ProcedureSubtask 70-23-13-550-050-A ** ON A/C NOT FOR ALL
A. Storage of flexible rings, hoses and rubber components:
(1) Storage Life
(a) The storage life of rubber ans synthetic rubber components is calculated from the cure date. It is written on the part and/or on the parts related container. It is applicable to all rubber or synthetic rubber parts, bonded rubber to metal parts, cables, harnesses, hoses and hose assemblies. This does not include hoses on assembled units and accessories. It is only related to parts that are not installed.
(b) Cure dates are divided into quarters as follows:
1st quarter - January, February and March
2sd quarter - April, May and June
3rd quarter - July, August and September
4th quarter - October, November and December
The quarter number and the year, with the letter Q in between gives the cure date. A cure date of 2Q91 shows the cure date as April, May or June of 1991. On some parts, the month in which the part was made, is shown in parentheses, for example 2Q91 (MAY). Thus a part with a cure date of 2Q91 will have used one year of its storage life on the 30th June 1992.
(2) Cure Dates
(a) Cure dates of rubber or synthetic rubber parts, that are not installed, are shown as follows:
1 Parts sufficiently large to have the cure data written on them (this does not include seal rings but does include diaphragms and bulkhead seals) are stamped or stencilled with a permanent marking fluid. The color must be different to the color of the material.
2 Parts which are too small, also seal rings, have a label attached to them and then put into a container. The container must have the cure date, IAE part number, batch number and makers name or reference number written on them.
3 Hoses are identified with two groups of numbers and letters, continuously writeen on the lenght of the hose. The first group gives makers data, the second group gives the length, or batch number and the cure date as follows:
a The first four numbers - length or batch number.
b The subsequent or middle number and letter - quarter symbol and 0 (cure date).
c The last two numbers - year symbol (cure date).
Example: 01012Q87 - 101st length or batch made in the second quarter of 1987.
4 Hose assemblies also have identification tags as follows:
a Code tag (the same data as on the hose).
b Identification tag (shows hose piece number, test date, inspectors mark and makers identification).
c Cure date tag (shows cure date of hose).
(3) Storage of Parts
(a) Keep the rubber and synthetic rubber parts in good condition. Make sure the storage conditions give you the maximum storage life. Storage of the parts must be in conditions that give maximum protection against: damage, sunlight, ozone, moist conditions, large airflows, temperatures that are too hot or too cold and contamination (from fuels, oils, greases and solvents). If the parts are supplied in containers, they must be kept in their containers until they are used. Do not keep the parts in storage for a long time. The rate of use is to be related to the quantity of the parts, use the part with the least life remaining first. Do not let the rubber parts touch metals.
(b) Do not keep the parts in conditions that will cause tension, but keep them in their correct shape. Do not store too many parts together vertically, this can cause permanent distortion of the lower layers. Store flexible hoses straight, when possible, to prevent tension and the increased risk of ozone cracks in the bends.
(c) You must supply sufficient ventilation to prevent condensation.
(d) Store lip-type seals so their sealing edge will not be damages or distorted. Do not attach labels directly to the seal. Do not install seal rings on to fer rules and bobbins until immediately before installation, this will prevent distortion.
(e) Keep the storage temperature in the range of 15 deg.C (59 deg.F) 21 deg.C (70 deg.F) but a minimum of 5 deg.C (41 deg.F) and a maximum of 38 deg.C (100 deg.F) is permitted. The relative humidity is to be 65 percent. Keep the parts at least 36 in. (0.9 m) from a source of heat.
(f) If the parts are stored as recommended in this TASK there will be almost no limit to the storage life. It will be necessary to do regular checks on some materials, and so the materials are divided into three groups.
1 Group A
a Natural rubber - MS717
These can be supplied to a customer to a maximum of five years after the cure date. The subsequent storage life has no limit if the material is satisfactory after inspection of those parts that were stored for the longest time. Two years is the maximum recommended time between inspections. Refer to step 5.
2 Group B
a Butyl - MS754, MS757
b Neoprene (chloroprene) - MS710, MS716 (BS2752, grade C3 or C4)
These can be supplied to a customer to a maximum of seven years after the cure date. The subsequent storage life has no limit if the material is satisfactory after inspection of those parts that were stored for the longest time. Three years is the maximum recommended time between inspections.
c Nitrile - MS727, MS735, MS743, MS744, MS747, MS765; MSRR9454, MSRR9455; BSEM602; DTD5509, DTD5595, DTD5607.
These can be supplied to a customer to a maximum of ten years after the cure date. The maximum storage life is 15 years.
3 Group X
a Silicone, Fluorosilicone and Fluorocarbon (Vitron) - MS732, MS741, MS751, MS756, MS761, MS771; MSRR9450 (MS762), MSRR9451 (MS782), MSRR9452 (MS766), MSRR9453, MSRR9490; BSEM608, BSEM534; DTD900/4882A, DTD5543, DTD5603, DTD5612, DTD5613.
There is no life limit for supply to a customer or for storage. The cure date is only an aid to monitor part quantity.
(a) Examine the parts for surface cracks or deterioration. Carefully bend the part to see if it is cracked. If it is cracked discard the part.
(b) Do not discard parts because they have a white or colored bloom on their surface. These blooms are good protection layers and come from the anti-oxidants used in high grade rubber.
(c) Examine parts for the defects that follow and discard if defective:
1 Permanent distortion, flats and other defects.
2 A tacky surface or a surface that has become hard or soft.
3 A peeled or cracked surface when part is bent or extended.
4 Chafed outer covers and corrosion or damage to end connections of hose assemblies and cable harnessess.
5 Corrosion of the metal in bonded rubber to metal assemblies.
6 Blockage of the bore (flexible hoses).
(d) Do a pressure test on flexible hoses as specified in the applicable engine manual. When the pressure test is complete, drain the hose, blow through with clean air and seal the ends with blanks.
(e) Do a test on electrical cables and harnessess for resistance where applicable. Also do a check for insulation resistance, continuity, chafed loom and satisfactory condition of the end connections. This will be specified in the applicable engine manual.
(1) Storage Life
(a) The storage life of rubber ans synthetic rubber components is calculated from the cure date. It is written on the part and/or on the parts related container. It is applicable to all rubber or synthetic rubber parts, bonded rubber to metal parts, cables, harnesses, hoses and hose assemblies. This does not include hoses on assembled units and accessories. It is only related to parts that are not installed.
(b) Cure dates are divided into quarters as follows:
1st quarter - January, February and March
2sd quarter - April, May and June
3rd quarter - July, August and September
4th quarter - October, November and December
The quarter number and the year, with the letter Q in between gives the cure date. A cure date of 2Q91 shows the cure date as April, May or June of 1991. On some parts, the month in which the part was made, is shown in parentheses, for example 2Q91 (MAY). Thus a part with a cure date of 2Q91 will have used one year of its storage life on the 30th June 1992.
(2) Cure Dates
(a) Cure dates of rubber or synthetic rubber parts, that are not installed, are shown as follows:
1 Parts sufficiently large to have the cure data written on them (this does not include seal rings but does include diaphragms and bulkhead seals) are stamped or stencilled with a permanent marking fluid. The color must be different to the color of the material.
2 Parts which are too small, also seal rings, have a label attached to them and then put into a container. The container must have the cure date, IAE part number, batch number and makers name or reference number written on them.
3 Hoses are identified with two groups of numbers and letters, continuously writeen on the lenght of the hose. The first group gives makers data, the second group gives the length, or batch number and the cure date as follows:
a The first four numbers - length or batch number.
b The subsequent or middle number and letter - quarter symbol and 0 (cure date).
c The last two numbers - year symbol (cure date).
Example: 01012Q87 - 101st length or batch made in the second quarter of 1987.
4 Hose assemblies also have identification tags as follows:
a Code tag (the same data as on the hose).
b Identification tag (shows hose piece number, test date, inspectors mark and makers identification).
c Cure date tag (shows cure date of hose).
(3) Storage of Parts
(a) Keep the rubber and synthetic rubber parts in good condition. Make sure the storage conditions give you the maximum storage life. Storage of the parts must be in conditions that give maximum protection against: damage, sunlight, ozone, moist conditions, large airflows, temperatures that are too hot or too cold and contamination (from fuels, oils, greases and solvents). If the parts are supplied in containers, they must be kept in their containers until they are used. Do not keep the parts in storage for a long time. The rate of use is to be related to the quantity of the parts, use the part with the least life remaining first. Do not let the rubber parts touch metals.
(b) Do not keep the parts in conditions that will cause tension, but keep them in their correct shape. Do not store too many parts together vertically, this can cause permanent distortion of the lower layers. Store flexible hoses straight, when possible, to prevent tension and the increased risk of ozone cracks in the bends.
(c) You must supply sufficient ventilation to prevent condensation.
(d) Store lip-type seals so their sealing edge will not be damages or distorted. Do not attach labels directly to the seal. Do not install seal rings on to fer rules and bobbins until immediately before installation, this will prevent distortion.
(e) Keep the storage temperature in the range of 15 deg.C (59 deg.F) 21 deg.C (70 deg.F) but a minimum of 5 deg.C (41 deg.F) and a maximum of 38 deg.C (100 deg.F) is permitted. The relative humidity is to be 65 percent. Keep the parts at least 36 in. (0.9 m) from a source of heat.
(f) If the parts are stored as recommended in this TASK there will be almost no limit to the storage life. It will be necessary to do regular checks on some materials, and so the materials are divided into three groups.
1 Group A
a Natural rubber - MS717
These can be supplied to a customer to a maximum of five years after the cure date. The subsequent storage life has no limit if the material is satisfactory after inspection of those parts that were stored for the longest time. Two years is the maximum recommended time between inspections. Refer to step 5.
2 Group B
a Butyl - MS754, MS757
b Neoprene (chloroprene) - MS710, MS716 (BS2752, grade C3 or C4)
These can be supplied to a customer to a maximum of seven years after the cure date. The subsequent storage life has no limit if the material is satisfactory after inspection of those parts that were stored for the longest time. Three years is the maximum recommended time between inspections.
c Nitrile - MS727, MS735, MS743, MS744, MS747, MS765; MSRR9454, MSRR9455; BSEM602; DTD5509, DTD5595, DTD5607.
These can be supplied to a customer to a maximum of ten years after the cure date. The maximum storage life is 15 years.
3 Group X
a Silicone, Fluorosilicone and Fluorocarbon (Vitron) - MS732, MS741, MS751, MS756, MS761, MS771; MSRR9450 (MS762), MSRR9451 (MS782), MSRR9452 (MS766), MSRR9453, MSRR9490; BSEM608, BSEM534; DTD900/4882A, DTD5543, DTD5603, DTD5612, DTD5613.
There is no life limit for supply to a customer or for storage. The cure date is only an aid to monitor part quantity.
NOTE: Parts in groups A and B (not Nitrile) supplied to a customer for immediate use on engines, thus not to be stored, could have no storage life remaining. This is permitted because the markers storage conditions are very good.
NOTE: Material specification numbers are only written on containers.
(4) The Inspection of Parts (a) Examine the parts for surface cracks or deterioration. Carefully bend the part to see if it is cracked. If it is cracked discard the part.
(b) Do not discard parts because they have a white or colored bloom on their surface. These blooms are good protection layers and come from the anti-oxidants used in high grade rubber.
(c) Examine parts for the defects that follow and discard if defective:
1 Permanent distortion, flats and other defects.
2 A tacky surface or a surface that has become hard or soft.
3 A peeled or cracked surface when part is bent or extended.
4 Chafed outer covers and corrosion or damage to end connections of hose assemblies and cable harnessess.
5 Corrosion of the metal in bonded rubber to metal assemblies.
6 Blockage of the bore (flexible hoses).
(d) Do a pressure test on flexible hoses as specified in the applicable engine manual. When the pressure test is complete, drain the hose, blow through with clean air and seal the ends with blanks.
(e) Do a test on electrical cables and harnessess for resistance where applicable. Also do a check for insulation resistance, continuity, chafed loom and satisfactory condition of the end connections. This will be specified in the applicable engine manual.