TRANSMITTAL SHEET

SUBJECT: SERVICE BULLETIN NO. 64B10-3, ROTORS - Rotary Wing Head - Ultrasonic

Inspection of Horizontal Hinge Pin

This page transmits Revision D, dated October 15/2007, to Service Bulletin No.

64B10-3, dated April 21/95.

Please insert the attached pages, which are a complete reissue of Service Bulletin No.

64B10-3. Destroy the superseded pages so that the contents will be as follows:

Page No. Revision Date

1 through 14 D October 15/2007

The text changed by this revision is indicated by a vertical line in the left-hand margin

of the page.

REVISION FEATURES: To designate the type of Service Bulletin on title page heading, added

"(E)" for essential.

 Section 1. PLANNING INFORMATION, Paragraph A. NOTE deleted "Co." ,

paragraph C. removed "S" from "(S45°/60°steel)". Paragraph D., NOTE, reworded and 

changed "ASTM E-1444-93" to "ASTM E-1444 (latest revision)" and deleted last part

of sentence. Deleted paragraph G. Materials and renumbered remaining paragraphs.

Updated paragraph G. Special Equipment to read "Special Tools", updated list if tools.

Updated paragraph J., references to current manual usage.

Section 2. ACCOMPLISHMENT INSTRUCTIONS, CAUTION changed "ASMT

TC-1A LEVEL II" to "ASNT SNT-TC-1A LEVEL II, ISO 9712 LEVEL II".

Paragraph A., NOTE, reworded and changed "ASTM E-1444-93" to "ASTM E-1444"

and deleted last part of sentence. Paragraph A., (3) added "Remove plugs and", and

changed "(Fed Spec P-D-680, Type 2)" to "(MIL-PRF-680, Type II or III)". Paragraph

A., (4) reworded sentence and added NOTE. Paragraph B., (2) changed "BR

0504-S45/S60)" to "(6455-40234-001)" and "(BNC-to-BNC)" to "(BNC-BNC)", (3)

changed "(ESMT-K3-7043)" to "(6470-11175-001)". Paragraph B., (4) NOTE's

SERVICE BULLETIN 64B10-3
Erickson Air-Crane Incorporated

Barbara F. Stiger

Technical Publications Manager

changed "CRT" to "A-scan". Paragraph B., (5) changed "(Hamikleer 712-2, SAE 30

WT. Oil, or equivalent)" to "(Sonotech Soundsafe, SAE 30 WT. Oil, or equivalent)"

and corrected figure reference. Paragraph B., (9), (e) changed "CRT" to "screen" and

changed NOTE, "Stavely Sonic-Model-139-P" to "Sonic 1000S/1200S series". 

Paragraph B. (10), added "(Figure 5)" reference. Paragraph C. (1), NOTE changed

"Move" to "Rotate", CAUTION, added "PROBE SELECTOR". Paragraph C. (2)

NOTE's changed "CRT" to "LCD". Paragraph C. (3), reworded and updated

information. Paragraph C. (8) was changed to a "NOTE", replaced "suspicion" to

"indication", and moved below new paragraph (11), remaining paragraphs were

renumbered. Updated specifications in new paragraphs C. (12), (13). Replaced all of the 

Figures in this section with new illustrations and added Figure 7.

Section 3. MATERIAL INFORMATION, Updated all of the materials and

specifications found in Section 3.
October 19/79

Revision D - October 15/2007

1. PLANNING INFORMATION

A. Effectivity

Model: S-64E Series

Component: S1510-23099-1 Horizontal Hinge Pin

S1510-23099-001 Horizontal Hinge Pin

NOTE: Erickson Air-Crane expanded dash (-) number ending of part number

from one digit to three digits, although the two part configurations are

identical and interchangeable.

B. Reason

To detect possible circumferential cracks in two specific areas of the shank diameter of the

horizontal hinge pin.

C. Description

The ultrasonic inspection (UT) method is used to detect possible circumferential cracks in two

areas of the horizontal hinge pin. The inspection is performed using the contact method and

angle beam ultrasonic techniques in the bore of each hinge pin (Figure 1). The angle beam

inspection is performed using a dual 5 MHz - 1/4 inch (45°/60° steel) contact bore probe

transducer assembly (Figure 2). The probe is selectively switched to the aft transducer (45°)

position used for the smaller diameter inspection, or to the forward transducer (60°) position

used for the larger diameter inspection. This inspection may be done with the hinge pin installed 

on the helicopter.

Service Bulletin

NO. 64B10-3

(E)

SUBJECT: ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

Page 1 of 14
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 2

D. Compliance

The manufacturer believes compliance to be essential and recommends accomplishment of the

work outlined herein as follows:

(1) On all horizontal hinge pins with 1100 flight hours or more, within the next 20 flight

hours or within 200 flight hours since last fluorescent magnetic particle inspection as

specified in the below NOTE, ultrasonically inspect per Section 2. Accomplishment

Instructions.

NOTE: Horizontal hinge pins are to be fluorescent magnetic particle inspected per

ASTM E-1444 (latest revision), using wet continuous method and consisting of

one or more distinct magnetizing operations.

CAUTION: IN NO CASE SHALL THE FLIGHT HOUR LIMITATION OR

YEAR CALENDAR TIME BE EXCEEDED PRIOR TO

ACCOMPLISHING THE ULTRASONIC INSPECTION.

(2) At next 200 flight hours after initial ultrasonic inspection, or one year, whichever

comes first, and every 200 flight hours thereafter, or at one year intervals, whichever

comes first, ultrasonically inspect horizontal hinge pins per Section 2. Accomplishment

Instructions.

E. Approval

FAA Approval

F. Manpower

Preparation of ultrasonic 2 0.3 0.6

inspection per horizontal

hinge pin

Instrument calibration 1 0.3 0.3

Ultrasonic inspection per 1 0.3 0.3

horizontal hinge pin

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

1. PLANNING INFORMATION (Continued)
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

Page 3

October 19/79

Revision D - October 15/2007

G. Special Tools

Dual Transducer Bore

Hinge Pin Reference Standard

Sonic Portable Ultrasonic Flaw Detectors, 1000S/1200S series, or equivalent. May be

purchased from Olympus NDT Inc., 48 Woerd Avenue, Waltham MA 02453.

H. Electrical Load Data

Not affected

I. Weight and Balance

Not affected

J. References

Maintenance Manual for Model S-64E Helicopter Publication Number EAC007

K. Other Publications Affected

None

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

1. PLANNING INFORMATION (Continued)
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 4

WARNING: OBSERVE ALL CAUTIONS AND WARNINGS ON THE

CONTAINERS WHEN USING CONSUMABLES. WHEN

APPLICABLE, WEAR PROTECTIVE GEAR DURING HANDLING

AND USE. IF A CONSUMABLE IS FLAMMABLE OR EXPLOSIVE,

MAKE CERTAIN CONSUMABLE AND ITS VAPORS ARE KEPT

AWAY FROM HEAT, SPARK, OR FLAME. MAKE CERTAIN

HELICOPTER IS PROPERLY GROUNDED AND FIRE FIGHTING

EQUIPMENT IS READILY AVAILABLE PRIOR TO USE. FOR

ADDITIONAL INFORMATION ON TOXICITY, FLASHPOINT, AND

FLAMMABILITY OF CHEMICALS, CONSULT THE

MANUFACTURER OF THE CONSUMABLES.

CAUTION: ULTRASONIC INSPECTION MUST BE PERFORMED BY

PROPERLY TRAINED PERSONNEL HAVING SPECIFIC

ULTRASONIC INSPECTION TRAINING EQUIVALENT TO

ASNT SNT-TC-1A LEVEL II, ISO 9712 LEVEL II OR SPECIFIC

TRAINING CONDUCTED BY THE TYPE CERTIFICATE HOLDER.

A. On all horizontal hinge pins with 1100 flight hours or more, within the next 20 flight hours or

within 200 flight hours since last fluorescent magnetic particle inspection, ultrasonically

inspect as follows:

NOTE: Horizontal hinge pins are to be fluorescent magnetic particle inspected per ASTM

E-1444 using the wet continuous method and consisting of one or more distinct

magnetizing operations.

(1) Position main rotor head to gain access to the threaded end of the horizontal hinge pin

(Figure 1).

(2) Disconnect pitch control rod assembly (6410-21007-013) from the spindle horn to gain

access to the hinge pin bore per Maintenance Manual.

(3) Remove plugs and clean hinge pin bore and exposed surface of corrosion preventive

compound using a clean cloth, damp with solvent (MIL-PRF-680, Type II or III).

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

Page 5

October 19/79

Revision D - October 15/2007

Figure 1. Inspection Areas Horizontal Hinge Pin

C4146.IR.64B10-3D

(4) Using a light, check that the internal surface of the hinge pin to be inspected is clean

and free from any foreign material or evidence of corrosion, which would prevent good

surface contact of transducer assembly.

NOTE: If corrosion is found, remove and replace hinge pin.

(5) Comply with paragraphs B. through E.

B. Calibrate ultrasonic instrument for inspection of hinge pin as follows:

(1) Turn on ultrasonic instrument and allow to warm up as required by instrument manual.

(2) Connect dual transducer bore probe assembly (6455-40234-001) to instrument using

interconnecting cable (BNC-BNC) as required. (Figure 2)

(3) Insert the dual transducer bore probe assembly completely into the Hinge Pin Standard 

(6470-11175-001). (Figures 3 and 4)

CAUTION: MAKE SURE SWITCH IS NOT MOVED DURING TEST.

(4) Place dual transducer bore probe selector switch in the 45° mode position.

NOTE: The 45° mode position is used to inspect the 2.125 inch diameter area. See

Figure 5 for a typical A-scan presentation.

NOTE: The 60° mode position is used to inspect the 2.250 inch diameter area. See

Figure 6 for a typical A-scan presentation.

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 6

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

(5) Fill syringe with couplant (Sonotech Soundsafe, SAE 30 WT. Oil, or equivalent) and

thread syringe into couplant port. Depress plunger and rotate probe 360° to apply

couplant to calibration area. (Figure 1)

(6) Adjust instrument to obtain a response from reference notch as probe is rotated at a rate

not to exceed 10° per second.

(7) Maximize (peak) response from reference notch.

(8) Adjust instrument sensitivity control (gain) until a response of 80 percent full scale

height (FSH) from notch is obtained.

(9) The following minimum instrument requirements should be maintained:

(a) Frequency - selected to match transducer assembly - 5 MHz.

NOTE: If equipment has broadband capability, stay within 2 to 10 MHz range; if

frequency selection is not compatible, the next highest frequency to the

transducer assembly should be used.

C4147.IR.64B10-3D

Figure 2. Dual Transducer Probe Assembly (6455-40243-001)
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

Page 7

October 19/79

Revision D - October 15/2007

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

(b) Instrument Reject of Suppression Control - adjusted to obtain desired calibration

response with minimum amplification and desired baseline noise.

(c) Damping- minimum.

(d) Gain/Sensitivity - adjusted to obtain desired calibration response with minimum

amplification and desired baseline noise.

(e) Screen Range and Delay - selected to position calibration response and

indications in center of screen with enough range to indicate full metal coverage.

NOTE: When using the Sonic 1000S/1200S series, the 1 to 3 inch range is

suggested.

(f) Transducer Mode Selection - pulse echo position (single).

(g) Pulse Repetition Frequency (PRF) - maximum.

(10) Rotate probe 90° in area of reference notch (not to exceed 10° per second) to verify

detectability of reference notch at calibration level. (Figure 5)

NOTE: This shall be the scanning rate used for inspection.

C. Ultrasonically inspect hinge pin as follows:

(1) Insert the dual transducer bore probe assembly completely into the bore of the hinge

pin.

NOTE: Rotate blade up or down, as required, to gain access to bore with probe, and 

hold blade in this position.
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 8

Figure 3. Transducer Assembly in Horizontal Hinge Pin

C4148.IR.64B10-3D

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

CAUTION: MAKE SURE PROBE SELECTOR SWITCH IS NOT MOVED

DURING TEST.

(2) Place probe selector switch in the 45° mode position.

NOTE: The 45° mode position is used to inspect the 2.125 inch diameter area. See

Figure 5 for typical LCD presentation.

NOTE: The 60° mode position is used to inspect the 2.250 inch diameter area. See

Figure 6 for typical LCD presentation.

(3) Fill syringe with couplant (Sonotech Soundsafe, SAE 30 WT. Oil, or equivalent) and

thread syringe into couplant port. Depress plunger and rotate probe 360° to apply

couplant to calibration area (Figure 1).

(4) Rotate probe 360° to scan inspection area at a rate not to exceed 10° per second.

(5) A hinge pin having ultrasonic indications equal to or greater than 60 percent full scale

height is suspect.
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

Page 9

October 19/79

Revision D - October 15/2007

Figure 4. Configuration of Ultrasonic Hinge Pin Standard

C4149.IR.64B10-3D

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

(6) If hinge pin is suspect, recalibrate instrument on Hinge Pin Standard per paragraph B.,

and recheck pin per paragraph C.

(7) If rechecked pin has ultrasonic indications equal to or greater than 60 percent full scale

height, using a felt marking pen, identify at threaded end of pin the locations of

ultrasonic responses that exceed specified inspection criteria.

(8) Remove suspect hinge pin from service prior to further flight if pin has ultrasonic

indication equal to or greater than the 60 percent full scale height. Contact Erickson

Air-Crane, Product Support Department. Advise them of the suspect pin and forward

suspect pin for further analysis.
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 10

TYPICAL A-SCAN PRESENTATION

80% FSH RESPONSE FROM 0.012 INCH NOTCH

C4229.IRSB64B10-3

80% CALIBRATION 

RESPONSE

60% REJECTION LEVEL

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

(9) Replace suspect pin with a pin that meets the requirements of this Service Bulletin.

(10) Place probe selector switch in the 60° mode position and calibrate ultrasonic instrument

per paragraph B., steps (3) through (10). (Figure 6)

(11) With probe selector switch in 60° mode position, ultrasonically inspect the 2.250 inch

diameter area per steps (3) through (9) of this paragraph.

NOTE: If a crack-like indication appears between clock angles of 7:00 to 11:00, as

viewed from threaded end of pin (Figure 7), it may be caused by echoes

from the locking flat. To verify indication, remove spacer and screws and

attempt to dampen signal by applying couplant to the area and rubbing with

finger. If indication moves up and down amplitude-wise, it is considered

non-relevant and hinge pin is acceptable.

Figure 5. Ultrasonic Response From Fabricated Notch in 2.125 Inch Diameter

Area With Transducer at 45° Mode Position
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

Page 11

October 19/79

Revision D - October 15/2007

Figure 6. Ultrasonic Response From Fabricated Notch in 2.250 Inch Diameter Area 

With Transducer at 60° Mode Position

TYPICAL A-SCAN PRESENTATION

80% FSH RESPONSE FROM 0.010 INCH NOTCH

C4230.IRSB64B10-3

80% CALIBRATION 

RESPONSE

60% REJECTION LEVEL

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

(12) If existing hinge pin is found satisfactory, reapply corrosion preventive compound

(MIL-PRF-16173, Grade I), to pin bore area prior to reassembly.

(13) Seal pin, as it extends through spindle ear, with sealing compound (AMS-S-8802, Type

2, Class B-1/2). Reinstall plugs.

(14) Connect pitch control rod assembly to acceptable horizontal hinge pin per the

Maintenance Manual.

(15) Repeat calibration and inspection requirements per paragraphs B. and C., for each of the 

remaining five horizontal hinge pins.

D. At next 200 flight hours after initial inspection, or one year, whichever comes first, and 

every 200 flight hours thereafter, or at one year intervals, whichever comes first, 

ultrasonically inspect horizontal hinge pins per paragraphs A., B., and C.
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 12

ROTORS - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

2. ACCOMPLISHMENT INSTRUCTIONS (Continued)

C4150.IR.64B10-3D

Figure 7. Clock Angles Where Ultrasonic Response May Be in Error 

E. Record of Compliance

(1) Make an appropriate maintenance record entry to show:

(a) Compliance with ultrasonic inspection

(b) Incorporation of Section 2. ACCOMPLISHMENT INSTRUCTIONS into the

maintenance program.
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

Page 13

October 19/79

Revision D - October 15/2007

ROTOR - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

3. MATERIAL INFORMATION

A. Basis for Material Data

Not applicable

B. Bill of Material

When ordering parts, reference this Service Bulletin. Parts required for this inspection are listed

below:

New Part No. Qty Description Old Part No.

Instructions/

Disposition

6455-40234-001 1 Dual Transducer Bore BP 0504-S45/S60 (1) (2)

6470-11175-001 1 Hinge Pin Reference

Standard

ESMT-K3-7043 (1)

BNC-BNC 1 Cable Assembly None (1)

6470-11177-301 1 Hinge Pin Reference

Standard

None (1) (3)

Sonic 1000S+ 1 Ultrasonic Flaw

Dectector with

Battery, Charger &

Accessories

 None (3)

(1) May be obtained from Erickson Air-Crane Product Support Department.

(2) Where equipment and cable interconnection are not compatible, the cable instrument

termination end should be modified to be compatible.

(3) Optional: Can be purchased as a kit which includes:

(1) 6470-11178-307 Transit Case

(1) Sonic 1000S+ Ultrasonic Flaw Detector with Battery, Charger, & 

Accessories

(2) 6455-40234-001 Bore Probe

(1) 6470-11175-001 Reference Standard

(1) Tube Sonotech Soundsafe Couplant

(6) 10CC Luer-Lock Couplant Syringes
ERICKSON AIR-CRANE

SERVICE BULLETIN NO. 64B10-3

October 19/79

Revision D - October 15/2007 Page 14

ROTOR - Rotary Wing Head - Ultrasonic Inspection of Horizontal Hinge Pin

3. MATERIAL INFORMATION (Continued)

C. Consumable Material

WARNING: OBSERVER ALL CAUTIONS AND WARNINGS ON THE

CONTAINERS WHEN USING CONSUMABLES. WHEN APPLICABLE, 

WEAR PROTECTIVE GEAR DURING HANDLING AND USE. IF A 

CONSUMABLE IS FLAMMABLE OR EXPLOSIVE, MAKE CERTAIN

CONSUMABLE AND ITS VAPORS ARE KEPT AWAY FROM HEAT, 

SPARK, OR FLAME. MAKE CERTAIN HELICOPTER IS PROPERLY 

GROUNDED AND FIRE FIGHTING EQUIPMENT IS READILY 

AVAILABLE PRIOR TO USE. FOR ADDITIONAL INFORMATION ON 

TOXICITY, FLASHPOINT, AND FLAMMABILITY OF CHEMICALS,

CONSULT THE MANUFACTURER OF THE CONSUMABLE.

As Required Ultrasonic couplant Sonotech Soundsafe

or

Ultrasonic couplant SAE-30 WT. Oil

As Required Solvent MIL-PRF-680,

Type II or III

As Required Corrosion Preventive Compound MIL-PRF-16173,

Grade I

As Required Sealing Compound AMS-S-8802. Type 2, 

Class B-1/2,

As Required 10CC Luer-Lock Couplant Syringes