t •**~.~,.,~_.,,,.,.**

DATI: R

EV

MODEL AFFECTED:

1 

### SUBJECT:

HELIOOPTERS AFFECTED: 

### COMPLIANCE: DESCRIPTION: 

### ALERT SERV CE 

### BULlE

## &i~:iiit•J:I o:.-' II

Modei2221J 

### HYDRAUliC ACTUATOR SUPPORT 

### PIN 222-040- 125oo0011 INSPECTION OF Mot\l! el 222U heHcopters serial 

### mumber 47501 through 4757 4. With 

### n 25 hours 

### followiflt9l rrecei 

### pt of 

### th is trulill: rlli n _ 

### A Mod e1 222U helicopter was i n flight when it experienced a contra 

### I loss_ The cause of 

### control loss was attributed 

### to the main rotor hydraulic actuator support separating 

### from th.e transmission . A ll 

### retain ing · studs were found 

### sheared or pulled out 

### at the 

### junction of the sup 

### port with the transmission upper 

### and lcr.ver 

### cases. The purpose of this bulletin JS to require a one-ti me i nspection of the hydrau lic actuators support instal lation 

### by accompl ishing a torque check of the support attactnng 

### nuts. In add ifion. 

### a Revision 

### to the maintenance 

### manual w:ill i ntroduce 

### a recurri ng torque check ofthe support attaching nuts . APPROVAL: Not required MANPOWER: Approximately .5 mao- hour is required to complete this bulletin 

### if the support 1s not '" removed 

### from 11he transmission , 

### An additional 

### 6 man-hours will be required to remove. :-' inspect and reinstall the support Manahours are based on hands-on time, and 

### may 

### vary with personnel and faoilfties available. "· "'

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..- INN .,._.., P -.r ... J R- H, T - 1.; r It Ahll .t: PI F. n,r-rr f.1 U.J. R J 1 l**~\'** r 'It r, 

# II222U -00-57 Page 2 of 6 MATERIAL: Required Material: The following material is required for the accomplishment of this bulletin and may be obtained through your Bell Helicopter Textron Supply Center. Part Number Nomenclature Quantity * MS21042L4 Nut 4 * MS21042L5 Nut 4 * 222-040-268-001 Washer 4 * 222-040-268-003 Washer 4 * Nuts are required only if actuator support is removed for inspection . Consumable Material: The following material is required to accomplish this bulletin , but may not require ordering , depending on the operator's consumable material stock levels . This material may be obtained through your Bell Helicopter Textron Supply Center. Part Number Nomenclature Quantity Reference * MILS8784CLB2 Sealant 

### 3.50Z C-328 

### * Sealant is required only if actuator support is removed for inspection . SPECIAL TOOLS: None required WEIGHT AND BALANCE : N ot affected ELECTRICAL LOAD DATA: Not affected 

# ..

# ..

REFERENCES: BHT-222U-MM-6 , Chapter 63 BHT-222U-MM-9 , Chapte r 71 BH T-222-CR&0-2 , Chapte r 63 BHT-AL L SPM PUBLICATIONS AFFECTED: BHT-222U-MM-2 , Chapter 5 BHT-222-CR&0-2 , Chapter 63 ACCOMPLISHMENT INSTRUCTIONS: 222U-00-57 Page 3 of 6

1. Remove fairings and cowlings as required to ga in access to the hydraulic actuators support . Refer to BHT-222 U-MM-9 , Chapte r 71. 2 . Verify that the dowel pins installed in the transmission upper case are not missing and that evidence of sealant is present at the joint between the actuator support and the transmission . Refe r to figure 2 . If any of the pins are missing and/o r if no sealant is visible , remove the actuator support and proceed to step 5. 3 . Ve rify torque of actuators support P/N 222-040-125-00 1 attaching nuts . Apply the torque in the tightening direction . For the upper row of nuts , if 40 in . lb . is reached without nut movement , increase the torque to 50-70 in .lb plus tare . For the lowe r row of nuts , if 90 in . lb . is reached without nut movement , i ncrease the torque to 100- 140 in .l b plus tare . -N OTEAnti fretting washers installed between the actuator support and the transmission lowe r case may be reinstalled provided the coating is not worn through or damag ed 4 . If two or more of the nuts within the upper row of the support attaching nuts move below 40 in.lb torque or two or more of the nuts within the lower row of the support attaching nuts move below 90 in .lb torque, remove the hydraulic actuators support from the transmission for further inspection and repair . Refer to BHT-222U-MM-6, Chapter 63 and BHT-222-CR&0-2 , Chapter 63 for removal instructions. Discard nuts and washers . 5 . If required, inspect the support P/N 222-040-125-001 in accordance with instructions in BHT-222-CR&0-2, Chapter 63. The holes at the lower and upper end of the support were manufactured to the dimensions shown in figure 1.222U-00-57 Page 4 of 6 6 . If required, inspect the transmission lower case assembly as follows: a) Inspect surface of transmission case in contact with the actuator support for damage , fretting and corrosion. Refer to BHT-222-CR&0-2 , Chapter 63 for damage/wear limits . b) Inspect the studs , retaining the actuators support , for condition of threads and for looseness . Replace damaged studs in accordance with BHT-222-CR&0-2 , Chapter 63 and BHT-ALL-SPM. 7 . If required , inspect the transmission upper case assembly as follows: a) Inspect surface of transmission case in contact with the actuator support for damage , fretting and corrosion . Maximum depth and/or size of corrosion , wear, scratches , nicks and marks shall not exceed 0.005 inch depth , 40% of any one square inch or more than 20% of the total surface . Pitting/corrosion around studs and dowel pins shall not exceed 0 .005 depth or 50% of the circumference of the stud/dowel pin . b) Inspect the studs , retaining the actuators support , for condition of threads and for looseness . Replace damaged studs in accordance with BHT-222-CR&0-2 , Chapter 63 and BHT-ALL-SPM. c) Inspect the dowel pins in transmission case for damage , fretting , corrosion and looseness. The large outboard pins should measure 0.500 inch minimum and protrude 0.55 inch from the surface of the case . The small inboard pins should measure 0.375 inch minimum and protrude 0.45 inch from the surface of the case. Refer to Figure 2 8 . If removed for inspection, reinstall actuators support on the transmission with new nuts and washers in accordance with instructions in BHT-222-CR&0-2 , Chapter 63 . Reinstall all parts previously removed in accordance with BHT-222U-MM-6, Chapter 63. 9 . Reinstall fairings and cowlings previously removed . Refer to BHT-222U-MM-9 , Chapter 71 . 10. Annotate helicopter records to reflect compliance with this bulletin.0.5008 - 0.5013 I N Dia. (12.72 - 12.73 mm)

0.343 - 0 .350 IND ia. (8.71 - 8.89 mm) Hydraulic Actuator Support Assembly P/N 222-040-125-001 Figure 1 222U-00-57 Page 5 of 6

0.5008 - 0.5013 IN Dia . (12.7 2 - 12.73 mm)

I LL00101222 U-00-57 Page 6 of 6

DOWEL P IN S Transmission Top Case Assembly

P/N 222-040-061-101 through 105 Figure 2

· I LL00102