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### NDIP-1142 Rev. A Effective 03-04-2013

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document 

### 1 

## PW2000 Diffuser/HPT Case M-Flange/Bolt hole Eddy Current Inspection (On-Wing / Module /Disassembled Component)

NDIP–1142 Rev. A

WARNING THIS DOCUMENT MAY CONTAIN INFORMATION SUBJECT TO THE INTERNATI ONAL TRAFFIC IN ARMS REGULATION (ITAR) OR THE EXPORT ADMINISTRATION REGULATION (EAR) OF 1979. THIS INFORMATION MAY NOT BE EXPORTED, RELEASED, OR DISCLOSED TO FOREIGN NATIONALS

OUTSIDE THE UNITED STATES WITHOUT FIRST COMPLYING WITH THE EXPO RT LICENSE REQUIREMENTS OF THE INTERNATIONAL TRAFFIC IN ARMS REGULATION (ITAR) AND/OR THE EXPORT ADMINISTRATION REGULATION (EAR). A VIOLAT ION OF THE ITAR OR EAR MAY BE SUBJECT TO A PENALTY OF UP TO 10 YEARS IMPRISONMENT AND A FINE OF $1,000 ,000 UNDER 22 U.S.C 2778 OR SECTION 2410 OF THE EXPORT ADMINISTRATION ACT OF 1979. INCLUDE THIS NOTICE WITH ANY REPRODUCED PORTION OF THIS DOCUMENT.

RESTRICTION PAGES OF THIS DOCUMENT MARKED WITH THE NOTICES SET FORTH BE LOW CONTAIN CONTRACTOR COMPETITION SENSITIVE DATA AND/OR PRATT & WHITNEY PROPRIETARY DATA WHICH IS SUBMITTED IN CONFIDE NCE. NO DISCLOSURE OR USE OF THIS INFORMATION IS PERMISSIBLE WITHOUT PRIOR WRITTEN CONSENT OF UNITED TECHNOLOGIES CORPORATION EXCEPT FOR OFFICIAL PURPOSES WITHIN THE U.S. GOVERNMENT.

DOCUMENT PROPERTY RIGHTS NOTICE THIS DOCUMENT IS THE PROPERTY OF UNITED TECHNOLOGIES CORPORATION (UTC). YOU MAY NOT POSSESS, USE, COPY OR DISCLOSE THIS DOCUMENT OR ANY INFORMATION IN IT, FOR ANY PURPOSE, INCLUDING WITHOUT LIMITATION TO DESIGN, MANUFACTURE OR REPAIR PARTS,

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### NDIP-1142 Rev. A Effective 03-04-2013

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### 2 PW2000 Diffuser/HPT Case M-Flange/Bolt hole Eddy Current Inspection (On-Wing / Module /Disassembled Component)

NDIP–1142 Rev. A

Instructions described within this proceduredo not replace, amend or supersede any instructions included in other Pratt & Whitney technical publications. Active Service Bulletins and other technical publications issued by Pratt & Whitney reflect official company procedures and policies.

Approved by: David A. Raulerson
Issue Date: 03/04/2013

### NDIP-1142 Rev. A Effective 03-04-2013

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### 3 PW2000 Diffuser/HPT Case

Eddy Current Inspection (On-Wing / Module /Disassembled Component)

I. GENERAL: The purpose of this eddy current inspection is to detect flaws in the OD Strap of the Diffuser/HPT Case. This inspection is conducted in two parts. The initial OD strap inspection is conducted 360  ̊ around the outer circumference of both the diffuser as well as the HPT Case (contingent on the configuration not being a scalloped flange). The second inspection is a bolt hole inspection that is designed to confirm the initial OD indication and subsequently evaluate any ID defects that may be of interest. The inspection sequence consists of a full OD strap inspection, where any anomaly noted requires the removal of the flange bolt at that given location. A bolt hole inspection is then required on those specific bolt hole(s). The confirmation of the OD strap indication using the bolt hole inspection is required, and the disposition of the ID indication(s) is based on the amplitude. This inspection is intended to be performed on-wing, but can be performed at the module or piece part level. The inspection requires 360  ̊ access to the “M” Flange which requires the disassembly of certain brackets. The flange has to be thoroughly cleaned after gaining access to the entire circumference of the flange. The access requirements vary by engine model as well as configuration. Refer to the required technical data for engine preparation and disassembly/reassembly instructions. Both the primary flange and secondary bolt hole inspections are performed by a handheld eddy current test utilizing the UniWest US-454 eddy current instrument. The bolt hole inspection uses a UniWest ECS-1 handheld rotator to drive the rotary contact bolt hole probe during that portion of the inspection. The OD strap is inspected by an eddy current probe using an absolute shaped coil technology operating at 400kHz. The subsequent bolt hole inspection is conducted by an eddy current probe using a differential coil technology operating at 2.25MHz.

### NDIP-1142 Rev. A Effective 03-04-2013

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### 4 The inspection sequence is as follows: 3⁄4 Confirmation of 360  ̊ Access to Case 3⁄4 Visual Inspection of Physical Damage (Dings/Dents etc.) 3⁄4 Pre–inspection preparation 3⁄4 Numbering of Bolt Holes on Diffuser Case 3⁄4 Pre–inspection calibration procedure 3⁄4 Inspection procedure 3⁄4 Evaluation procedure 3⁄4 Re-Inspection of indications 3⁄4 Post–inspection calibration procedure 3⁄4 Accept/Reject analysis 3⁄4 Report completion This procedure is provided as an inspection training guide. Refer to the approved Technical Data for current requirements.Pratt & Whitney technical data describing part inspections using a UniWest US454 eddy current instrument is written with a level of detail that assumes the basic instrument is properly configured and tested by the manufacturer, and that the qualified NDT inspectors using it are familiar with operating the instrument in accordance with the UniWest US-454 System User Manual.
II. REFERENCES: A. Standard Practices Manual, P/N 585005

B. PW2000 Engine Manual P/N 1A6231

C. Applicable PW2000 Engine Manual Sections
D. UniWest US-454 Eddy Current User Manual
III. INSPECTOR QUALIFICATIONS: Inspectors performing this inspection to determine part airworthiness must be qualified in accordance with the Standard Practices Manual, P/N 585005, Section 70-37-02, Eddy Current Inspection requirements for personnel qualification. It is also recommended that twenty four (24) hours of instruction and familiarization with test equipment, probes, and inspection technique take place. The final inspector qualification is contingent upon conducting and passing the POD study during the specified training period. Re-training is required after the inspector has been inactive in conducting the inspection for more than 6 months.

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### 5 IV. PROCEDURE: A. EQUIPMENT REQUIRED

Figure 1 UniWest US-454 Eddy Current Instrument

1. 

### Required non-PWA Equipment a) US-454 Eddy Current Instrument
b) Flash Card Reader
c) US-2923 OD Flange Probe with the following guides

(1) 83645-2 Front Guide (Required) (2) 83645-3 Short Rear Guide (Optional) (3) 83645-4 Long Rear Guide (Optional) Front Guide (Required) Rear Guides (2) & (3) (Optional)

Coil Location

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### 6 Figure 2 US-2923 OD Flange Probe 

### d) UniWest ECS-1 Bolt Hole Rotator

Figure 3 UniWest ECS -1 Bolt Hole Rotator 

### e) US-2926 UniWest Bolt Hole Probe

Figure 4 UniWest US- 2926 Bolt Hole Probe


### NOTE: The above-denoted US-454 Eddy Current Instrument and accessories are available from the following supplier:

UniWest 122 South 4 th

### Avenue Pasco, WA 99301 USA Tel: (509) 544-0720 Fax: (509) 544-0868

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### 7 2. Other Required Tools;

a. NDIP 1142 Inspection kit. To include scotch brite, clipboard, TEC (Trace Element Certified) Sharpie Markers, silver pencils, ink pen, data sheets.

b. Calibration Standard and accompanying Calibration Card

Figure 5 Calibration Standard


### V. CONFIRMATION OF 360  ̊ CASE ACCESS 1. Confirm that there is unobstructed access to the entire 360  ̊ of the case that needs to be inspected. The removal requirements are listed in the accompanying Service Bulletin.
VI. INSPECTION DATASHEET 1. The inspection data sheet can be found on the last page of this procedure.
VII. VISUAL INSPECTION OF PHYSICAL DAMAGE Warning: If physical damage prevents the OD flange probe from seating properly on the flange, the default is to conduct the bolt hole inspection on all affected holes that are un-inspectable with the OD flange probe.
1. Visually inspect the entire 360  ̊ of the case for dings/dents/raised material and note the location of any observed damage. Any interference on the OD of the case that impedes the OD probe from inspecting the entire OD bolt hole circumference as seen in Figure 9 should be marked on the inspection datasheet as damage noted and inspected utilizing the bolt hole inspection.
NOTE: If the observed damage location is precisely along the center line of bolt hole, only that bolt hole requires inspection using the bolt hole inspection. If the damage is offset to the center line of a bolt hole, the adjacent bolt hole in the offset direction also needs to be inspected using the bolt hole inspection. If there are any doubts in the integrity of the OD inspection or there is liftoff observed due

### NDIP-1142 Rev. A Effective 03-04-2013

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### 8 to physical anomalies on the OD, the bolt hole inspection would be considered a requirement on those bolt holes.
VIII. INSPECTION PREPARATION
1. Ensure all necessary steps have been taken to ensure lock-out/tag out of the engine prior to inspection. Also ensure the engine temperature is cool or ambient. This should be achieved by allowing the engine to cool at least 4 hours prior to inspection. If the temperature is not sufficient at the time of inspection, forced air cooling or heating should be performed. Temperature limit for this inspection shall be limited to 40-110 degrees F.
2. Ensure that all required externals required to be removed as identified in the accompanying Service Bulletin have been completed.
3. Once 360  ̊ access has been gained, clean the entire “M” Flange using ScotchBrite and wipe it down with alcohol.
4. Identify Hole Position #1(Top Dead Center) by counting clockwise from Hole Position #8 FWD-looking-AFT as seen in Figure 6 and mark with a white paint pen. Label every 5 th

### hole with a white paint pen on the case of interest for visible identification of holes.

Figure 6 M-Flange Bracket Reference to locate Top Dead Center (TDC) 

### Hole Pos. #8

### NDIP-1142 Rev. A Effective 03-04-2013

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### 9 IX. PRE-INSPECTION CALIBRATION OD FLANGE INSPECTION
1. Cover the eddy current probe sensor with a smooth wrinkle free layer of Kapton tape. Tape should be applied across the entire contact face of the probe. Trim any excess tape with a razor blade.
2. Connect the probe to the US-454 eddy current instrument. Turn on the instrument and allow 5 minutes to warm up.
3. Set the US-454 to the following initial settings for calibration: Frequency: 400 KHz Gain: As required Probe Drive: High Low pass Filter: 200 Hz High pass: 0 Hz. Display: I-Plane Rotation Degrees: Vertical notch Response (as required) X Sensitivity 0.5 V/div Y Sensitivity 0.5 V/div X-Null Position 1.0 Div Y-Null Position -3.5 Div Persist (PERST) 2.0-3.0 Sec (as desired)

Figure 7 Probe Calibration Picture 

### 4. Place the Probe on Calibration standard as shown in Figure 7 and Press the Null button Scanning Direction

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### 10 5. Traverse the probe on the Calibration standard as seen in Figure 7 to obtain the calibration signal on the EDM notch.
6. Make adjustments to the phase angle until the signal is vertical. Vertical being defined as the top peak being on the same vertical line with the bottom point as shown by the asterisks in the picture. Repeat scanning operation as many times as necessary until signal appears similar to Figure 8 and the amplitude is as noted on Calibration Card supplied with the standard. NOTE: Once phase angle is determined which achieves vertical notch response signal, do not make any further modifications to the phase angle setting for the remainder of the inspection.

Figure 8 Vertical Notch Response


### 7. Calibrate the probe to the amplitude depicted on the calibration card to within ±0.5 Divisions.
NOTE : With this probe the direction of scanning does not influence notch response so either scan direction is acceptable. Notch Calibration Amplitude (as seen on Calibration Card) 

# *

*

### NDIP-1142 Rev. A Effective 03-04-2013

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### 11 8. Fill in the required information on the inspection data sheet documenting probe S/N, calibration standard S/N, and calibration settings.
X. UTILIZING THE REAR PROBE GUIDES
NOTE: In order to allow more stability when scanning on the OD flange inspection, the probe has two optional adjustable guides. It is not required to use these guides while performing the inspection, however, it is intended to add more stability if desired.
1. Null the probe with only the front guide installed when seated properly on the case.
2. Install the rear guide of choice without completely tightening the screws for the guide. Place the probe on the case and ensure that the null point on the screen returns to the X=1.0 Div and Y=-3.5Div, press on the rear guide until it is in firm contact with either the intermediate case or the opposing M-flange case to the one being inspected. Tighten the guide screws.
3. Remove and re-place the probe on the case, scan the OD surface slightly and ensure that probe is not rocking and the null point does not shift while scanning.
4. While performing the inspection with the rear guide, the guide might need to be re-adjusted if the null point shifts beyond 1.5Div in any direction on the screen while scanning.
XI. INSPECTION PROCEDURE OD FLANGE NOTE: Ensure that all required items in the “INSPECTION PREPARATION” section are completed prior to starting the inspection process.
1. Inspect all non-bracketed areas of the 360  ̊ of the OD Strap focusing on the bolt hole pattern circumference as shown in Figure 9 on the “M” Flange of the suspect case. During the inspection process, if any indications are noted, optimize the phase to achieve maximum vertical amplitude . If any indications greater than 3.0 Divisions after optimizing the phase response are identified, document the amplitude in the inspection sheet. Place an “X” mark adjacent to the Hole of interest for future identification of bolt hole Inspection. Make sure to return the phase angle to the calibration phase angle prior to continuing the inspection. Continue inspecting the remainder of the case until all bolt hole pattern circumferences have been inspected on the OD.

### NDIP-1142 Rev. A Effective 03-04-2013

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### 12 Note: Some indications may have a different phase response given the characteristics of the flaw observed such as small versus large, surface versus sub-surface etc.

Figure 9 Primary Focus Area & Response interpretation


### 2. Check inspection calibration by scanning the calibration block as seen in the inspection calibrations section.
Note: If the calibration value observed is not within ±0.5 Divisions of the calibration amplitude, re-calibrate and repeat the areas inspected since the last observed good calibration. Also, check tape wear on contact surface and determine if replacement is needed prior to recalibrating the probe.
3. Remove the guides from the probe and inspect all remaining areas of the 360  ̊ of the OD Strap focusing on the bolt hole pattern circumference as shown in Figure 9 on the “M” Flange of the suspect case. During the inspection process, if any indications are noted, optimize the phase to achieve maximum vertical amplitude . If any indications greater than 3.0 Divisions after optimizing the phase response are identified, document the amplitude in the inspection sheet. Place an “X” mark adjacent to the Hole of interest for future identification of bolt hole Inspection. Make sure to return the phase angle to the calibration phase angle prior to continuing the inspection. Continue inspecting the remainder of the case until all bolt hole pattern circumferences have been inspected on the OD.
4. Check inspection calibration by scanning the calibration block as shown in the inspection calibration section.

OD Bolt Hole Pattern Circumference Lift off Calibration Notch Response

Small Flaw Response

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### 13 Note: If the calibration value observed is not within ±0.5 Divisions of the calibration amplitude, re-calibrate and repeat the areas inspected since the last observed good calibration. Also, check tape wear on contact surface and determine if replacement is needed prior to recalibrating the probe.
XII. POST-INSPECTION CALIBRATION OD FLANGE 1. Re-scan the Calibration Block as shown in the Pre-inspection calibration section and record the noted amplitude on the datasheet. The post inspection amplitude should be within ±0.5 Divisions of the calibration amplitude.
XIII. ECS-1 ROTATOR ANGULAR POSITION INTERPRETATION
NOTE: For the purpose of this inspection, it is imperative that the operator thoroughly understand the positioning logic of the ECS-1 Rotator. While performing the inspection, if the positioning is not understood completely, then the inspection could result in a high number of false rejects with huge impact on the customer as well as the inspection disposition.
1. The ECS-1 Rotator has a position encoder which synchronizes with the screen position. The Position orientation of the Bolt Hole scanner is as shown below;

Figure 10 Bolt Hole Rotator Scanner Encoder Position


### 2. While performing the inspection, the bolt hole scanner assembly may have to be rotated to accommodate for the inspection, it is recommended that the scanner be rotated in increments of 90  ̊ such that the OD strap location and ID location are readily calculated. 0  ̊ /360  ̊

90  ̊

180  ̊ 270  ̊ 

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### 14 3. The angular position decoder should always be placed on the instrument while using the ECS-1 4. Each division on the screen corresponds to a 36  ̊ sector. A rotation of the scanner to the right is +36  ̊ and to the left is -36  ̊

. 5. The indication location should be measured by the first maximum positive peak location as shown in Figure 13 below.
XIV. BOLT HOLE INSPECTION CALIBRATION
1. Plug in the ECS-1 scanner cable to the instrument, and the other end to the ECS-1 handheld scanner.
2. Cover the eddy current probe sensor with a smooth wrinkle free layer ofTeflon tape. Tape should only be applied across the sensor of the probe only. PreCut before application, do not try to cut the tape while on the probe.
3. Insert some foam into the Bolt Hole Probe slit near the sensor side so the compression is firmer.
4. Plug in the US-2926 Bolt Hole Probe into the scanner.
5. Place the Angular position decoder on the instrument screen as shown in Figure 13 ;
6. Adjust the US-454 instrument settings to as seen below; Frequency: 2.25 MHz Gain: As Required Probe Drive: High Low pass Filter: 600 Hz High pass: 230 Hz. Display: O-Scope Rotation Degrees: Vertical notch Response (As Required) X Sensitivity 0.5 V/div Y Sensitivity 0.5 V/div O-Scope Trigger Scanner Sample Rate 10850 s/sec Oscilloscope Y Data Buffer Circular
7. Scan the calibration block as seen in the Figure 11below. Ensure that the response observed is vertical as shown in Figure 12. Notice that the material noise observed is slightly off normal when the notch response is adjusted to be vertical.

### NDIP-1142 Rev. A Effective 03-04-2013

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### 15 Figure 11 Bolt Hole Inspection Calibration

Figure 12 Phase Adjustment of Notch to Vertical
8. Change the instrument Display from I-Plane to O-Scope, ensure that the notch observed is located at 180  ̊ as seen in Figure 13. 

### Notch Response

Material Noise Response

### NDIP-1142 Rev. A Effective 03-04-2013

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### 16 Figure 13 Notch Response O-Scope mode


### XV. BOLT HOLE INSPECTION OF OD FLANGE INDICATIONS NOTE: This inspection requires re-taping and re-calibrating the probe after each individual bolt hole is inspected.
1. Inspect all bolt holes that exhibited an OD Flange indication one at a time using the bolt hole rotator. The primary focus area for this bolt hole inspection is the OD and ID Strap locations ±36  ̊ which is equivalent to ±1 Division on the instrument.
NOTE: The Angular locations for the OD-Strap and ID-Strap are contingent upon how the ECS-1 is being held during the bolt hole inspection and is as defined in the “ECS-1 rotator angular position interpretation” section. It is the responsibility of the inspector to determine the location of OD-Strap and ID-Strap angular locations prior to inspecting each bolt hole. The ECS-1 rotator is marked with Angular positions to assist with this. It is highly advised to determine how the rotator will be held during a given bolt hole inspection and determining the calculated locations for the OD and ID ahead of time. This will provide a focal angular location of interest on the instrument display that can easily be interrogated within ±1 Division.
2. If there is confirmation of a large OD-Strap indication from the bolt hole ( >6 Division ), inspect both the Diffuser case flange side as well as the HPT case flange from their respective sides on both the OD and ID sides. Document the location(s) and amplitude(s) for each observed indication and disposition per the Accept/Reject Criteria. Angular Position Decoder Angular Location

### NDIP-1142 Rev. A Effective 03-04-2013

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### 17 3. If there is no Confirmation of the OD-Strap indication on the suspect case side, inspect the ID area of interest on the suspect case. Ensure that there are no indications of noticeable amplitude on the suspect case on the ID side. If there are indications noted on the ID, record observed amplitudes on the datasheet and disposition per the Accept/Reject Criteria.
4. Repeat steps 1-3 for all bolt holes identified using the OD flange inspection on the suspect case side unless noted otherwise.
NOTE: If there are more than five bolt holes that require inspection, it is recommended that the probe go through post calibration after every fifth hole. At which time the probe should be re-taped and the calibration process be repeated. In the event that the tape on the probe tears, all holes inspected since last calibration will have to be re-inspected starting from the probe calibration process.
XVI. BOLT HOLE INSPECTION POST CALIBRATION
1. Re-scan the Calibration Block as shown in the bolt hole pre-inspection calibration section and record the noted amplitude on the datasheet. The post inspection amplitude should be within ±0.5 Divisions of the calibration amplitude.
XVII. ID INDICATIONS NOTED
1. If there are any indications noted on the ID side of any case, the indication can be polished per the “Bolt hole Polishing” procedure in Section 0.
2. Re-inspecting indications is required after the polishing process using the same bolt hole inspection as laid out in Sections XIV thru XVI. Document all post polishing amplitudes for each of the bolt holes. Disposition according to the Accept/Reject Criteria.
XVIII. ACCEPTANCE AND REJECTION CRITERIA
1. Using the datasheet of all indications noted, identify all the bolt holes that have an ID bolt hole ECI indication of notable amplitude. These bolt holes must be polished and re-inspected in accordance with sections 0 and XIV thru XVI respectively.
2. Size all the final observed ID bolt hole ECI indication amplitudes using Table 1 below;
3. If the final ID indication amplitude requires an FPI per Table 1, follow the steps in Section XX “FPI PROCESSING OF BOLT HOLE”. After completion of that process, disposition as required in Table 2 for the observed flaw size during the FPI process.
4. Trace through the disposition flow chart as shown in Figure 14 for all indications noted on both the OD flange indications as well as the bolt hole inspection indications for disposition.

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### 18 Note: If there are multiple Bolt holes that have indications and are noted to have different cycle time dispositions per the criteria provided, the lowest cycle time is the allowable flying limit for the recurring inspection. At which point all indications that require recurring inspections should be reviewed as well. Warning: If a single indication on a given case requires the removal of the case that constitutes an immediate removal regardless of additional indications being acceptable for a period of time.

FPI for Sizing Disposition Remaining Time <6 Divs No Re-inspect within 500 Cycles 6<12 Divs No Re-inspect within 250 Cycles >12 Divs YES Final Bolt Hole ID ECI Amplitude ECI Disposition Table

FPI Location and Utilize FPI Disposition Table 1 ECI Indication Disposition Table

Disposition Remaining Time >12 Divs 0.050"<0.100" Re-inspect within 250 Cycles >12 Divs 0.100"<0.170" Re-inspect within 120 Cycles >12 Divs  0.170" Remove Prior to Further Flight 0 Cycles FPI Disposition Table Final Bolt Hole ID ECI Amplitude FPI Indication Size on Face

Table 2 FPI Indication Disposition Table

Figure 14 Disposition Flow Chart


### XIX. BOLT HOLE POLISHING Required tools; 1. Dremel Cordless Rotary Tool (as provided in the kit) 2. Dremel 90  ̊ angle attachment (as provided in the kit)

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### 19 3. Abrasive polishing tips(Extra Fine Black Colored Tips, Fine Red Colored Tips all are as included in kit) 4. Mandrels (as provided in the kit) 5. Polishing Tips (White mandrel mounted polishing attachment as provided in the kit) 1. Attach the Dremel 90  ̊ angle attachment to the Dremel cordless rotary tool. Refer to the attachment manual for explicit instructions. 2. Attach either the extra fine or fine abrasive polishing tip onto the screw mandrel and install that assembly into the Dremel 90  ̊ attachment. 3. Polish the bolt hole with the observed indication no longer than 45 seconds at a time and no more than twice per each bolt hole. Ensure uniform coverage on the entire bore section of the bolt hole. The RPM setting on the Dremel tool should not exceed the 10,000 RPM setting. 4. Clean the bolt hole with a cotton swab wet with a SPOP 208 (Task 70-21-00-110- 040) solvent to remove all unwanted material
XX. FPI PROCESSING OF BOLT HOLE
NOTE : Use ultra high sensitivity (Level 4) penetrant (1) Clean the area with a cotton swab wet with a SPOP 208 (Task 70-21-00-110-040 ) solvent to remove all unwanted material. Refer to 70-21-00, SPOP 208 (Task 70-21-00- 110-040 ). Do not use too much solvent on the area. (2) Apply the applicable penetrant ultra high, with a cotton swab from the corner of the bolt hole to across the flange face.
NOTE : Do not mix different types or brands of penetrant. Penetrant PMC Options PMC 4354-1, PMC 4354-2, PMC 4354-3, PMC 4354-4, PMC 4354-6, PMC 4354-7, or PMC 4354-8 (a) Drain/dwell for 20 - 60 minutes (4) Clean the surfaces with a cloth or paper towel and SPOP 208 solvent to remove surface penetrant. Refer to 70-21-00, SPOP-208 (Task 70-21-00-110-040 ). Do not use too much solvent on the surfaces.
NOTE : It is very important to prevent too much solvent wiping, which can remove too much penetrant from a part. (5) Examine the surfaces for full removal of penetrant under ultraviolet light (UVL). (6) Very lightly apply one of the developers that follow: (b) Dry Developer ( PMC 4356 ). NOTE : Developer should be applied using dry bulb. (7) Let the developer absorb the penetrant for 10 minutes, minimum.

### NDIP-1142 Rev. A Effective 03-04-2013

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document 

### 20 CAUTION : INSPECTION MUST BE DONE IN A DARKENED AREA. WHITE LIGHT MUST NOT BE MORE THAN 2 FOOTCANDLES (20 LUX) AT THE INSPECTION SURFACE OF THE PART. (8) Examine the part under UVL. Make a mark around each indication and questionable area (that is, an area that possibly shows an unsatisfactory condition). (9) Do the subsequent procedure on all areas that show a moderate fluorescent background, and on all questionable or marginally unacceptable areas: (a) Lightly rub the area with a soft brush or cotton swab that is moist with a SPOP 208 solvent. Refer to 70-21-00, SPOP-208 (Task 70-21-00-110-040 ). Do not use too much solvent on the area. (b) Let the solvent on the surface dry, and then examine area again under UVL. (c) If the indication shows again immediately, then the indication is a result of a discontinuity. If you cannot easily see the initial mark around the indication, apply a new mark around the indication. (d) If the indication does not show again immediately, do the subsequent procedure:
1 Apply PMC 4356 dry developer to the area.
2Examine the area again under UVL. (10) Size the observed FPI indication using the following nomenclature, prior to disposition;

Figure 15 FPI Indication Sizing

### NDIP-1142 Rev. A Effective 03-04-2013

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document 

### 21 XXI. REVISION TRACKING Revision Letter Revision Date Changes Revision By A 3/4/13 Yellow Highlighted Areas A. Ahmed

### NDIP-1142 Rev. A Effective 03-04-2013

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document 

### 22 APPENDIX A