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TASK 72-00-00-200-807
1 . General.
A.This procedure gives detailed inspection guidelines for the engine accessories and line replaceable units (LRU).
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-20-00
Cleaning Engine Parts
 
70-21-14
Cleaning Method No. 14 - Manually-Assisted Detergent Cleaning
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-43-07
Chemical Touch-Up Surface Refinishing Process for Aluminum
D.Expendable Parts. None.
3 . Specific Inspection Guidelines for Engine Accessories and Line Replaceable Units (LRU).
Subtask 72-00-00-220-163
A.Do a general visual inspection (GVI) of the control and accessory components, either installed or removed for access. If defects are observed, refer to the inspection guidelines that follow or applicable Component Maintenance Manual (CMM) for serviceability limits.
NOTE:
A GVI is an inspection check. This is a visual inspection that will find apparent unsatisfactory conditions and defects.
Subtask 72-00-00-160-002
(1)If necessary, clean the part to do the GVI. Refer to TASK 70-20-00-100-001 (CLEANING ENGINE PARTS) and/or TASK 70-21-14-110-012 (CLEANING METHOD NO. 14 - MANUALLY-ASSISTED DETERGENT CLEANING).
Subtask 72-00-00-220-165
(2)Do an inspection for the fuel metering unit (FMU) as follows:
(a)Do a visual inspection of the FMU (01-010 , 73-21-40) (SIN 30000) and (01-021 , 73-21-40) (SIN 30000) for:
1Damage to machined or cast surfaces that are not sealing surfaces:
aDo an inspection for cracks, dents, gouges, nicks, grooves or scratches.
bParts with defects that have raised material can be repaired by removing raised material. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). If no repair is available, defects greater that 0.010 inch (0.25 mm) in depth or in height can be a cause for rejection.
cRepair surface finish. Refer to TASK 70-43-07-380-007 (CHEMICAL TOUCH-UP SURFACE REFINISHING PROCESS FOR ALUMINUM).
2Sealing surfaces are defined as those surfaces that are in contact with a mating seal (o-ring, packing, metal-to-metal). Examples are o-ring grooves, face seals, and AM fittings:
aDo an inspection of the o-ring grooves for damage of the sealing surface. Refer to Figure 801.
bDo an inspection of the face sealing surfaces within seal contact area for scratches or raised material. No defects are permitted. Refer to Figure 802.
NOTE:
Defects on sealing surfaces can be verified with a 0.039 inch (1.00 mm) spherical tipped probe by dragging the probe across the surface of the part with no downward pressure. If an indication of defect is felt with the probe (for example, probe hangs up on defect), the defect has been verified.
cDo an inspection of the AN type fittings. Examine the condition of the conical sealing surface. No defects are permitted in the center 60 percent conical seal surface.
NOTE:
Magnification aid is not required.
3Connector pins bent.
4Connector threads damaged.
NOTE:
Damage to the connector threads is permitted, if the sensor can be connected to the engine electrical harnesses.
(b)If the visual inspection check fails, replace the FMU.
Subtask 72-00-00-220-166
(3)Do a visual inspection of the flow split valve (FSVA) as follows:
(a)Do a visual inspection of the FSVA (01-010A , 73-21-30) (SIN 31700) for:
1Damage to machined or cast surfaces that are non-sealing surfaces:
aDo an inspection for cracks, dents, gouges, nicks, grooves, or scratches.
bParts with defects that have raised material can be repaired by removing the raised material. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). On machined or cast surfaces that are non-sealing surfaces, parts with defects more than 0.010 inch (0,25 mm) in depth or high can be a cause for rejection.
2Damage to sealing surfaces. Sealing surfaces are defined as those surfaces that are in contact with a mating seal (o-ring, packing, metal-to-metal).
aDo an inspection of the O-ring grooves for damage of the sealing surfaces. Refer to Figure 804.
bDo an inspection of the sealing surfaces within seal contact area for scratches or raised material.
NOTE:
Defects can be verified with a 0.039 inch (1.00 mm) spherical tipped probe by dragging the probe across the surface of the part with no downward pressure. No defects are permitted.
cExamine the condition of the conical sealing surfaces on the AN type fittings. No defects are permitted in the center 60 percent conical seal surface.
NOTE:
Magnification aid is not required.
Subtask 72-00-00-220-167
(4)Do a visual inspection of the main fuel oil heat exchanger (MFOHEx) as follows:
(a)Do a visual inspection of the MFOHEx (01-011 , 79-21-00) (SIN 40700), (01-012 , 79-21-00) (SIN 40700), (01-013 , 79-21-00) (SIN 40700), and (01-014 , 79-21-00) (SIN 40700) for:
1Damage to cases of MFOHEx.
aDo an inspection for corrosion, cracks, and holes on flanges and mounts. Reject parts if any of these conditions are found.
bDents, marks, scores, and scratches on any non sealing surface.
cParts with defects that have raised material can be repaired by removing the raised material. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). On machined or cast surfaces that are non-sealing surfaces, parts with defects more than 0.006 inch (0.152 mm) in depth or high can be a cause for rejection.
dDefects located on the heat exchanger cases near by small radiuses, abrupt changes on geometry and greater than 0.006 inch (0.152 mm) are not acceptable.
2Damage on transfer tubes.
aDo an inspection on the transfer tubes. Reject the part if corrosion, scores, or scratches on the sealing surfaces (o-ring groves) are found. Refer to Figure 805.
bDamage to the non-sealing surfaces up to 0.003 inch (0.076 mm) can be re-worked. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-00-00-220-168
(5)Inspect the VSV actuator as follows:
(a)Do a visual inspection of the VSV actuator (01-100 , 75-32-10) (SIN 30400) as follows:
1Do a check for defects. Defects are specified as:
•
Burr - A rough edge or a sharp protrusion on the edge of the surface of the parent material
•
Chip - A breaking away of the edge of the parent material
•
Crack - A parting of the parent material
•
Dent - A smooth surface depression
•
Erosion - Wearing away of material caused by fluids or particles
•
Flake - A thin, hanging chip or scale like a layer of material
•
Fretting - Wear, in rippled pattern caused by friction
•
Galling - An accumulation of material deposited on the parent material caused by relative motion between 2 parts
•
Gouge - A wide, rough scratch or scratches with one or more sharply impressed corners. Can have some parent material removed
•
Groove - A long, narrow, continuous impression
•
Nick - A surface deformation with sharp corners or bottoms
•
Oxidation - Surface deterioration caused by chemical reaction of air (oxygen) and parent metal
•
Pitting - A small depression or cavity with no sharp corners
•
Scratch - A long, narrow sharp cornered impression
•
Spalling - Broken or crushed material.
2Return the actuator if one of the following conditions is found:
•
Cracks
•
Galling.
3Return the part to the vendor if there is evidence of corrosion.
4On machined or cast surfaces that are non-sealing surfaces, parts with defects more than 0.010 inch (0,25 mm) in depth or high can be a cause for rejection.
5Parts with defects that have raised material can be repaired by removing the raised material. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
(b)Spanner nut inspection. Refer to Figure 806.
1Inspect the lockwire holding the spanner nut to the housing of the VSV actuator.
2Move the spanner nut (axially and radially) manually in order to find looseness between the spanner nut and the actuator housing.
3Use a filler gage 0.002 inch (0.05 mm) to examine any possible gaps between the actuator housing and the spanner nut.
NOTE:
The filler gage should slide in a minimum of 0.085 inch (2.00 mm) between the spanner nut and the housing to be considered a gap.
4Sealing surfaces inspection. Sealing surfaces are defined as those surfaces that are in contact with a mating seal (o-ring, packing, metal-to-metal). Refer to Figure 807.
5Do an inspection of the sealing surfaces within the seal contact area for scratches or raised material.
NOTE:
Defects can be verified with a 0.039 inch (1.00 mm) spherical tipped probe by dragging the probe across the surface of the part with no downward pressure. No defects are permitted.
6Examine the condition of conical sealing surfaces on the AN type fittings. No defects are permitted in the center 60 percent conical seal surface.
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Figure 801   O-ring Groove Sealing Surface
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Figure 802   Face Sealing Surface
Subtask 72-00-00-220-164
(6)Do a visual inspection of the alternator stator (01-010 , 73-21-60) (SIN 65301) as follows:
(a)Do a visual inspection to the exterior of the alternator stator (01-010 , 73-21-60) (SIN 65301) for:
  1Scuffs in the ablative coating with no metal exposed or metal exposed so that there is no more than 1.00 inch (25.4 mm) in diameter can be repaired. If more than 10 percent of the stator surface is exposed, the ablative coating can not be repaired.
2Sliced ablative coating where no metal is exposed can be repaired.
3Connector pins bent.
4Connector threads damaged.
NOTE:
Damage to the connector threads is permitted, if the stator can be connected to the engine electrical harnesses.
(b)If the visual inspection check fails for ablative coating damage, repair the alternator stator ablative coating. Refer to CMM 73-22-10.
Subtask 72-00-00-220-173
(7)Do a visual inspection of the air pressure sensor (01-170 , 75-11-30) (SIN 63701). Refer to Figure 803 and as follows:
(a)Do a visual inspection to the main body of the air pressure sensor (01-170 , 75-11-30) (SIN 63701) for:
1Dents or scratches less than or equal to 0.016 in. (0.41 mm) in depth are permitted.
2Connector pins bents.
3Connector threads damaged.
NOTE:
Damage to the connector threads is permitted if the stator can be connected to the engine electrical harnesses.
(b)If the sensor fails the visual inspection, replace the sensor.
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Figure 803   Air Pressure Sensor - Visual Inspection
Subtask 72-00-00-220-172
(8)Do a visual inspection for the transient bleed valve (TBV) (01-010 , 75-31-11) (SIN 60700) and (01-011 , 75-31-11) (SIN 60700). Refer to Figure 808 and as follows:
(a)Do a visual inspection of the external surfaces of the flow body and actuator.
1Machined or cast surfaces for cracks, dents, gouges, nicks, grooves or scratches:
aParts with defects that have raised material can be repaired by removing the raised material. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
bIf no repair is available, defects more than 0.010 inch (0.25 mm) in depth or in height can be a cause of rejection.
cRepair surface finish if blending performed on aluminum valve body. Refer to TASK 70-43-07-380-007 (CHEMICAL TOUCH-UP SURFACE REFINISHING PROCESS FOR ALUMINUM).
2Flow body clamp mating surfaces (non-seal side) of the V-style flange for high metal, nicks, scratches, and gouges:
aParts with defects that have raised material can be repaired by removing the raised material. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
bIf no repair is available, defects more than 0.040 inch (1.00 mm) in depth or 0.005 inch (0.12 mm) in height can be a cause of rejection.
3Sealing surfaces are defined as those surfaces that are in contact with a mating seal (o-ring, packing, metal-to-metal). Examples are AN fittings and AS1895   ring seal interface:
aDo an inspection of the AN type fittings o-ring grooves for damage of the sealing surface.
bDo an inspection of the AN type fittings conical sealing surface. No defects are permitted in the center 60 percent conical seal surface.
cDo an inspection of the flow body sealing surfaces for AN ring seals. No defects are permitted.
NOTE:
Magnification aid is not required.
4Connector pins bent.
5Connector threads damaged.
NOTE:
Damage to the connector threads is permitted, if the receptacle can be connected to the engine electrical harnesses.
(b)If the visual inspection check fails, replace the TBV.
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Figure 804   (Sheet 1 ) Flow Split Valve - Visual Inspection
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Figure 804   (Sheet 2 ) Flow Split Valve - Visual Inspection
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Figure 805   Main Fuel Oil Heat Exchanger - Visual Inspection
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Figure 806   Spanner Nut on the VSV Actuator - Visual Inspection
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Figure 807   Sealing Surfaces on the VSV Actuator - Visual Inspection
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Figure 808   Transient Bleed Valve (TBV) - Visual Inspection
Subtask 72-00-00-220-170
(9)Do a visual inspection to the exterior of the electronic engine control (EEC) as follows:
(a)Missing/peeling paint on the chassis is serviceable and permitted.
(b)If missing/peeling paint on the chassis is found, do an inspection for corrosion.
(c)If there is any indication of corrosion, return the part to the vendor.
(d)Refer to the applicable CMM for further serviceability assessment.
Subtask 72-00-00-220-171
(10)Do a visual inspection to the exterior of the engine maintenance unit (EMU) as follows:
(a)Missing/peeling paint on the chassis is serviceable and permitted.
(b)If missing/peeling paint on the chassis is found, do an inspection for corrosion.
(c)If there is any indication of corrosion, return the part to the vendor.
(d)Refer to the applicable CMM for further serviceability assessment.
Subtask 72-00-00-220-174
(11)Do a visual inspection of the fuel flow transmitter (01-010 , 73-31-00) (SIN 30800). Refer to Figure 809 and as follows:
(a)Do a visual inspection to the flange of the fuel flow transmitter (01-010 , 73-31-00) (SIN 30800) for:
1Damage to fuel flow transmitter flange area that are not sealing surfaces:
aDo an inspection for cracks, dents, gouges, nicks, grooves, or scratches.
bParts with defects that have raised material can be repaired when the raised material is removed. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). If no repair is available, defects greater than 0.040 inch (1.0 mm) in depth or in height can be a cause for rejection.
cRepair surface finish. Refer to TASK 70-43-07-380-007 (CHEMICAL TOUCH-UP SURFACE REFINISHING PROCESS FOR ALUMINUM).
(b)If the visual inspection fails check and cannot be repaired, replace the fuel flow transmitter.
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Figure 809   Fuel Flow Transmitter - Visual Inspection