DOC AIRBUS | AMM A320FMarking of Parts [PW11]
TASK 70-40-00-910-801-A
Marking of Parts
Self explanatory
2. Job Set-up Information
A. Consumable Materials
B. Referenced Information
3. Job Set-up
Subtask 70-40-00-869-050-A ** ON A/C NOT FOR ALL
Subtask 70-40-00-910-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 12:54:23 UTC
Marking of Parts
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.P05-018) | Pencil, metal marking |
| (Material No.P05-022) | Dye, layout and identification |
| (Material No.P05-026) | Ink, metal marking |
| (Material No.P05-040) | varnish phenolic |
| (Material No.P05-049) | Ink, metal marking |
| (Material No.P05-232) | Crayon, metal marking (soft) |
| (Material No.P05-366) | Dye, layout and identification |
| (Material No.P05-408) | Marker, felt tip, white |
| (Material No.P05-409) | Marker, felt tip, black |
| (Material No.P05-410) | Marker, felt tip |
| (Material No.P05-413) | Ink, temporary marking |
| (Material No.P05-414) | Marker, extra fine point (black) |
| (Material No.P05-416) | Chalk, white |
| (Material No.P05-417) | Marking pen (paint) |
| (Material No.P05-418) | Dye, layout and identification (blue) |
| (Material No.P05-419) | Dye, layout and identification (red) |
| (Material No.P05-423) | Marker, felt tip, rapid drying |
| (Material No.P05-441) | Ink, metal marking |
| (Material No.P05-465) | Ink, metal marking |
| (Material No.P05-470) | Marker, high purity (blue) |
| (Material No.P05-471) | Marker, high purity/high temperature (blue) |
| (Material No.P05-472) | Marker - high purity, black, trace element certified |
| (Material No.P07-001) | lacquer |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-27-00-910-804-A | SPOP 208 - Degreasing of Parts by Solvent Wiping |
Subtask 70-40-00-869-050-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 70-40-00-910-050-A ** ON A/C NOT FOR ALL
A. General
(2) Marks made on engine parts and assemblies must be easily read and must not be easily removed.
(a) Characters must be easily and accurately read usually without any aid to the eye.
(b) Where there are unusual area or surface limitations, a maximum of 3.5X magnification is permitted to get the necessary readability.
(c) The location of a mark must be as specified in the Service Bulletin or AMM maintenance task.
(4) All the characters in a mark, unless specified differently, must be 0.060 in. (1.5240 mm) to 0.160 in. (4.0640 mm) high. In special cases, when the mark is a function of the size or configuration of the part, characters not less than 0.016 in. (0.4064 mm) nor more than 0.500 in. (12.7000 mm) in height are permitted.
(5) If the surface specified for a mark will get a surface treatment coating (for example, paint), you must apply the mark before you apply the coating. Use an approved permanent marking method that will show through the final surface treatment.
(a) If none of the specified marking methods will show through the coating, then it is permitted to use the applicable step to make the mark after you apply the coating:
1 On the external surfaces, apply the mark with ink and a stamp, and then apply a full layer of lacquer (Material No.P07-001) on the mark.
2 On internal surfaces, apply the mark by the applicable step:
a If permitted by the repair instructions, apply the mark by the vibration peen method.
b Apply the mark with ink and a stamp, and then apply a full layer of varnish phenolic (Material No.P05-040) on the mark.
(6) In electric arc scribing (for example, hand arc scribing), the characters are made by the action of an electric arc between a surface and an electrode (scriber). Electric arc scribing is not a satisfactory marking method to use for jet engine parts and must not be used.
(7) In acid etching, the characters are made by the action of an acid on the surface of the part. Acid etching is not recommended because it can possibly cause corrosion.
(8) Soapstone must not be used to make a mark on engine parts.
(9) Wherever the vibration peen method is approved, identify the offset holes in the mating parts with a vibration peened "X" mark adjacent to the offset hole as long as the condition or operation of the part is not changed.
Subtask 70-40-00-910-051-A ** ON A/C NOT FOR ALL CAUTION:
THE MARK MUST NOT CHANGE THE CONDITION OR THE OPERATION OF THE PART. ONLY THE APPLICABLE PRATT & WHITNEY PROCEDURE IS TO BE USED TO MAKE MARKS.
(1) Always obey the specific procedures and limits in the specific AMM maintenance tasks. (2) Marks made on engine parts and assemblies must be easily read and must not be easily removed.
(a) Characters must be easily and accurately read usually without any aid to the eye.
(b) Where there are unusual area or surface limitations, a maximum of 3.5X magnification is permitted to get the necessary readability.
(c) The location of a mark must be as specified in the Service Bulletin or AMM maintenance task.
NOTE: Be sure to apply the mark only on a surface that will not move relative to a surface that touches it after you assemble the parts.
(3) Except where specified differently, reidentification of parts, reapplication and/or relocation of marks on a part must be done adjacent to, or in a location almost the same as that of the initial marking. Where reidentification or corrective marking is specified, removal of all or part of the old marking can be necessary. In these cases, use an approved marking method to draw a wavy line, loop, flat oval, or X's through the character(s) or symbol(s) to be removed. (4) All the characters in a mark, unless specified differently, must be 0.060 in. (1.5240 mm) to 0.160 in. (4.0640 mm) high. In special cases, when the mark is a function of the size or configuration of the part, characters not less than 0.016 in. (0.4064 mm) nor more than 0.500 in. (12.7000 mm) in height are permitted.
(5) If the surface specified for a mark will get a surface treatment coating (for example, paint), you must apply the mark before you apply the coating. Use an approved permanent marking method that will show through the final surface treatment.
(a) If none of the specified marking methods will show through the coating, then it is permitted to use the applicable step to make the mark after you apply the coating:
1 On the external surfaces, apply the mark with ink and a stamp, and then apply a full layer of lacquer (Material No.P07-001) on the mark.
2 On internal surfaces, apply the mark by the applicable step:
a If permitted by the repair instructions, apply the mark by the vibration peen method.
b Apply the mark with ink and a stamp, and then apply a full layer of varnish phenolic (Material No.P05-040) on the mark.
(6) In electric arc scribing (for example, hand arc scribing), the characters are made by the action of an electric arc between a surface and an electrode (scriber). Electric arc scribing is not a satisfactory marking method to use for jet engine parts and must not be used.
(7) In acid etching, the characters are made by the action of an acid on the surface of the part. Acid etching is not recommended because it can possibly cause corrosion.
(8) Soapstone must not be used to make a mark on engine parts.
(9) Wherever the vibration peen method is approved, identify the offset holes in the mating parts with a vibration peened "X" mark adjacent to the offset hole as long as the condition or operation of the part is not changed.
B. Permanent Marking Methods
(1) General
(a) Permanent methods of marking are those in which marking is legible during the normal service life of the part.
(b) Permanent markings must not extend onto any radius, chamfer, sharp edge, bead, or fillet adjacent to the specified marking surface.
(2) Applied marking methods
(a) Metal stamping
1 Characters are produced by forcible displacement of material.
a Hammer - characters are made one at a time or in groups by a force applied mechanically or manually.
b Press - characters are produced individually or in groups by a force applied as you steadily increase the controlled pressure.
c Roll - characters are made as the part or the tool or both the part and the tool turn when they touch each other under a controlled force.
2 Stamps used for marking must make fillets and radii at all intersecting surfaces of the characters.
3 Parts marked by this method must have the marking area sufficiently back-supported to prevent dangerous stresses.
4 This method is not permitted if the hardness of the part at the time of marking is higher than Rockwell C45 or equivalent.
5 If the metal is raised more than 0.001 in. (0.0254 mm) by this method of marking, it is necessary to carefully remove it.
1 Characters are made by vibrations from a radius-tipped, conical tool.
a Manual - tool is manually guided and has one tip.
b Mechanical - tool is mechanically guided and has one or more tips that can make one or more full characters at the same time.
2 This method is not usually permitted if the hardness of the part at the time of marking is higher than Rockwell C45 or equivalent. It can be used on parts harder than Rockwell C45 when specifically permitted.
1 Characters are made by a manually or mechanically guided cutter or grinder that turns.
(d) Brand
1 Characters are made by burning or displacing non-metallic material with a hot tool.
(e) Drag impression
1 Characters are made when material is moved by force by a radius-tipped conical tool, which is drawn (dragged) across the surface of the part. This tool is mechanically guided and turns freely.
(f) Blast
1 Characters are made when an abrasive material hits the characters in the stencil area.
(3) Marking depth
(a) The depth of the marks must be in these maximum limits, unless specified differently:
Subtask 70-40-00-910-052-A ** ON A/C NOT FOR ALL (1) General
(a) Permanent methods of marking are those in which marking is legible during the normal service life of the part.
(b) Permanent markings must not extend onto any radius, chamfer, sharp edge, bead, or fillet adjacent to the specified marking surface.
(2) Applied marking methods
(a) Metal stamping
1 Characters are produced by forcible displacement of material.
a Hammer - characters are made one at a time or in groups by a force applied mechanically or manually.
b Press - characters are produced individually or in groups by a force applied as you steadily increase the controlled pressure.
c Roll - characters are made as the part or the tool or both the part and the tool turn when they touch each other under a controlled force.
2 Stamps used for marking must make fillets and radii at all intersecting surfaces of the characters.
3 Parts marked by this method must have the marking area sufficiently back-supported to prevent dangerous stresses.
4 This method is not permitted if the hardness of the part at the time of marking is higher than Rockwell C45 or equivalent.
5 If the metal is raised more than 0.001 in. (0.0254 mm) by this method of marking, it is necessary to carefully remove it.
NOTE: It is necessary to remove all raised metal around the characters on the surfaces of bearings that touch.
(b) Vibration peen method 1 Characters are made by vibrations from a radius-tipped, conical tool.
a Manual - tool is manually guided and has one tip.
b Mechanical - tool is mechanically guided and has one or more tips that can make one or more full characters at the same time.
2 This method is not usually permitted if the hardness of the part at the time of marking is higher than Rockwell C45 or equivalent. It can be used on parts harder than Rockwell C45 when specifically permitted.
NOTE: The vibration peen method can be an alternative to use on those parts that had drag impression or roll marking.
(c) Engraving 1 Characters are made by a manually or mechanically guided cutter or grinder that turns.
(d) Brand
1 Characters are made by burning or displacing non-metallic material with a hot tool.
(e) Drag impression
1 Characters are made when material is moved by force by a radius-tipped conical tool, which is drawn (dragged) across the surface of the part. This tool is mechanically guided and turns freely.
(f) Blast
1 Characters are made when an abrasive material hits the characters in the stencil area.
(3) Marking depth
(a) The depth of the marks must be in these maximum limits, unless specified differently:
| Marking method | Depth limit |
|---|---|
| Metal Stamp, Hammer | 0.010 in. (0.254 mm) |
| Metal stamp, press and | 0.006 in. (0.152 mm) |
| roll | |
| Vibration peen, manual | 0.006 in. (0.152 mm) |
| and mechanical | |
| Engrave, manual and | 0.003 in. (0.076 mm) |
| mechanical | |
| Brand | 0.010 in. (0.254 mm) |
| Drag impression | 0.003 in. (0.076 mm) |
| Blast | 0.0005 in. (0.013 mm) |
C. Temporary Marking Methods
(1) General
(b) When you use a marking pencil, do not apply marks to the surfaces of carbon seal plates or to mating surfaces of finished machined parts. Marking material remaining on these parts could cause incorrect results during dimensional inspection and assembly.
(c) These marking materials must be removed:
1 Chalk
a After inspection is completed, remove chalk from parts. Use Degrease Engine Parts by Solvent Wipe (SPOP 208) (Ref. AMM TASK 70-27-00-910-804).
2 Dye, layout and identification
a Remove layout and identification dye from parts before you assemble the parts in the engine. Use Degrease Engine Parts by Solvent Wipe (SPOP 208) (Ref. AMM TASK 70-27-00-910-804).
(2) Marking methods
(a) Ink marking
1 Characters are made by ink application that does not change the surface as mechanical methods do.
(a) This material is used to highlight stamped or vibration peened part numbers during inspection and is approved to use on all gas turbine engine alloys if you remove the material after the inspection is completed:
1 Chalk
aP05-416 Chalk, white
(b) These materials are approved to use on steel, stainless steel, cobalt-base alloys, aluminum, magnesium, titanium, titanium alloys, and on nickel-base alloys other than nickel superalloys (for example, PWA 1422 or PWA 1480) unless specified differently below:
1 Crayons
aP05-232 Crayon, metal marking (soft)
2 Dyes, layout and identification
aP05-022 Dye, layout and identification
bP05-366 Dye, layout and identification
cP05-418 Dye, layout and identification (blue)
dP05-419 Dye, layout and identification (red)
3 Inks (applied by a brush or stamp)
aP05-026 Ink, metal marking
P05-049 Ink, metal marking
P05-026 Ink, metal marking
P05-413 Ink, temporary marking
*P05-441 Ink, metal marking
P05-465 Ink, metal marking
P05-423 Marker, felt tip, rapid drying
P05-414 Marker, extra fine point (black)
cP05-408 Marker, felt tip, white
dP05-409 Marker, felt tip, black
eP05-410 Marker, felt tip
fP05-470 Marker, high purity (blue)
gP05-471 Marker, high purity/high temperature (blue)
hP05-472 Marker - high purity, black, trace element certified
5 Pencils
aP05-018 Pencil, metal marking
6 Pens
aP05-417 Marking pen (paint)
(1) General
CAUTION:
USE ONLY THE APPROVED MATERIALS SPECIFIED IN THE PMC'S FOR MARKING.
CAUTION:
DO NOT USE LEAD AND/OR METALLIC PENCILS OR ANY TEMPORARY MARKING METHOD THAT CAN CAUSE DANGEROUS REMAINING CARBON, ZINC, COPPER, LEAD OR SIMILAR MATERIAL TO OCCUR ON A PART. THIS REMAINING MATERIAL CAN CAUSE A REDUCTION IN FATIGUE STRENGTH AS A RESULT OF CARBURIZATION OR INTERGRANULAR ATTACK WHEN HEAT OF HIGH INTENSITY IS APPLIED TO THE PART. IF A MARKING MATERIAL THAT IS NOT APPROVED IS USED, THE MARK MUST BE FULLY REMOVED BY THE SPOP 208 SOLVENT WIPE PROCEDURE.
(a) Temporary methods of marking are those in which the marks will correctly identify a part during the usual handling, inspection, and storage of items before final assembly and use. (b) When you use a marking pencil, do not apply marks to the surfaces of carbon seal plates or to mating surfaces of finished machined parts. Marking material remaining on these parts could cause incorrect results during dimensional inspection and assembly.
(c) These marking materials must be removed:
1 Chalk
a After inspection is completed, remove chalk from parts. Use Degrease Engine Parts by Solvent Wipe (SPOP 208) (Ref. AMM TASK 70-27-00-910-804).
2 Dye, layout and identification
a Remove layout and identification dye from parts before you assemble the parts in the engine. Use Degrease Engine Parts by Solvent Wipe (SPOP 208) (Ref. AMM TASK 70-27-00-910-804).
(2) Marking methods
(a) Ink marking
1 Characters are made by ink application that does not change the surface as mechanical methods do.
NOTE: Usually, ink stamping, when used as a temporary marking method, can be applied to a surface which, after assembly, does not move in relation to a surface that it touches (that is, a contact surface).
(3) Marking materials (a) This material is used to highlight stamped or vibration peened part numbers during inspection and is approved to use on all gas turbine engine alloys if you remove the material after the inspection is completed:
1 Chalk
a
(b) These materials are approved to use on steel, stainless steel, cobalt-base alloys, aluminum, magnesium, titanium, titanium alloys, and on nickel-base alloys other than nickel superalloys (for example, PWA 1422 or PWA 1480) unless specified differently below:
1 Crayons
a
2 Dyes, layout and identification
a
b
c
d
3 Inks (applied by a brush or stamp)
a
NOTE: The black P05-026 ink, metal marking
b NOTE: The white P05-049 ink, metal marking
c NOTE: The black P05-026 ink, metal marking
* *
NOTE: The white P05-441 ink, metal marking
* NOTE: The green P05-465 ink, metal marking
4 Markers CAUTION:
FELT TIP MARKER (MATERIAL NO. P05-423) IS DIFFICULT TO REMOVE FROM ALUMINUM ALLOYS. THUS, DO NOT USE THIS MARKER FOR TEMPORARY INSPECTION OR IN-PROCESS MARKING ON ANODIZED OR FINISHED SURFACES OF ALUMINUM ALLOY PARTS OF THE GAS TURBINE ENGINE.
a NOTE: The P05-423 marker, felt tip, rapid drying
NOTE: The Marks-A-Lot markers for PMC 4050-1 (black/chisel point) and PMC 4050-4 (black/fine point) are also approved to use on nickel superalloys and on ceramic coatings.
NOTE: The Sharpie markers for PMC 4050-4 (black/fine point) and all markers for PMC 4050-17 (black/bold fine point), PMC 4050-7 (red/fine point), PMC 4050-12 (red/extra fine point), PMC 4050-15 (red/ultra fine point), and PMC 4050-18 (red/bold fine point) are also approved to use on ceramic and overlay and aluminide coatings.
NOTE: All PMC 4050-6 (blue/fine point) and all PMC 4050-16 (blue/ultra fine point) markers are approved to use on aluminide coatings.
NOTE: The P05-423 marker, felt tip, rapid drying
b c
d
e
f
g
h
5 Pencils
a
6 Pens
a