# ~111111111111111. ALERT SERVICE BULLETIN

# ~~ F

# =.:.·.1.! ,. t NO. 47-08-25 

## HSiiC::Op 

# er DATE May 26, 2008 1 of6 ,. DATE REV

MODEL AFFECTED: SUBJECT: HELICOPTER AFFECTED: COMPONENTS AFFECTED:

COMPLIANCE:

DESCRIPTION: A Textron Company PAGE

47 MAIN ROTOR BLADES BOX BEAM CLIPS, ONETIME INSPECTION OF. All Model47 having 047-110-250-021 or -023 Main Rotor Blades installed. 047-110-250-021 Main Rotor Blade serial number A-303, A-304, A-312 and A-316. 047-110-250-023 Main Rotor Blade serial number A-298, A-301 and A-305. PART 

### 1: For main rotor blades in spares stock, immediately upon receipt ofthis bulletin. PART II: For main rotor blades installed on a helicopter, a One-time ferry flight notto exceed 5 flight hours is authorized.

This Alert Service Bulletin mandates a one-time inspection of the affected main rotor blades for conformity. Box beam clips incorrectly installed may cause main rotor blade spar crack. APPROVAL: The engineering design aspects ofthis bulletin are FAA 

### I DER approved .

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEWOWNER 

# ,. ,. ,. ,. ,. ,. ,.**".11.1.1.11.1.1.1.11.1.1.1~ ~** ASB 47-08-25 Page 2 of 6 MANPOWER: PART 1: Approximately 1 man-hour is required to complete PART I ofthis bulletin . PART II : Approximately 4.0 man-hours are required to complete PART II of this bulletin. Man-hours are based on hands-on time, and may vary with personnel and facilities available. WARRANTY: Owners I Operators of Bell Helicopters who comply with the instructions detailed in part I, and part II ofthis Bulletin will be eligible for special warranty consideration . To receive this warranty; comply with the instructions for inspection on main rotor blades listed in the components affected section ofthis bulletin . Should inspection reveal that one or more ofthe clips are incorrectly installed the blade is unserviceable. Remove the blade from stock or the aircraft and order a replacement blade from a Bell approved source, file a VISTAwarranty claim referencing this ASS. BHT will require that the data tag is removed and notification to your local Customer Support Representative who will collect the tag , and witness the destruction ofthe blade. Customers who fail to comply with the instructions in this Bulletin after the 31st July 2008 are not eligible for the special warranty exceptions listed above. No other labor cost will be covered under this Bulletin. MATERIAL: The following material may be required for the accomplishment ofthis bulletin and can be obtained through your Bell HelicopterTextron Supply Center. Part Number 047-11 0-250-021 047-11 0-250-023 Nomenclature Blade Blade Quantity 

### AIR AIRConsumable Material: ASB 47-08-25 Page 3 of 6

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 MIL-PRF-16173,GR 1 MIL-PRF-16173,GR 2 AMS-S-8802 Class B2 SPECIAL TOOLS: None required WEIGHT AND BALANCE: Not Affected ELECTRICAL LOAD DATA: Not affected REFERENCES: Nomenclature Corrosion Preventive Compound Corrosion Preventive Compound Sealant

Applicable Model 47 Illustrated Parts Breakdown Applicable Model 47 Maintenance & Overhaul Instructions PUBLICATIONS AFFECTED: None affected Quantity Reference AIR C-101 AIR C-104 AIR C-308ASB 47-08-25 Page 4 of 6 ACCOMPLISHMENT INSTRUCTIONS: PART 1: Inspection of main rotor blades in spares stock. 1 . Remove the screws that secure the tip cap and the root end cover. 2. Using a plastic scraper, carefully remove the tip cap and the root end cover. 3. Using a bright light, inspect box beam clips for correct installation from both ends ofthe blade. 4. Figures 1 and 2 show box beam clips correctly installed, while Figure 3 shows a clip installed incorrectly. 5. Ifthe clips are correctly installed , the blade is serviceable. 6. Install tip cap and secure with screws. Torque 20-25 in-lbs. 7. Apply sealant (C-308) to mating faces of the root end cover and the blade. Install cover and secure with screws. Torque to 20-25 in-lbs. 8. Make an entry in the helicopter records to indicate that the blade had the ASB 47-08-25 accomplished and it is serviceable. 9. If one or more clips are incorrectly installed , the blade is unserviceable. Submit a complete MMIR to BHTI Warranty Department for a replacement blade.• 

# •

PART II: One time inspection of blades installed on helicopter.-NOTEASB 47-08-25 Page 5 of 6

Use applicable Model 47 Maintenance and Overhaul Instructions for component removal and installation instructions. 1 . Remove the affected main rotor blade from the helicopter. 2. Remove the screws that secure the tip cap and the root cover. 3. Using a plastic scraper, carefully remove the tip cap and the root end cover. 4. Using a bright light, inspect box beam clips for correct installation from both ends ofthe blade. 5. Figures 1 and 2 show box beam clips correctly installed, while Figure 3 shows a clip installed incorrectly. 6. Ifthe clips are correctly installed ,the blade is serviceable. 7. Install tip cap and secure with screws.Torque 20-25 in-lbs. 8. Apply sealant (C-308) to mating faces of the root end cover and the blade. Install cover and secure with screws.Torque to 20-25 in-lbs. 9. Make an entry in the helicopter records to indicate that the blade had the ASB 47-08-25 accomplished and it is serviceable. 1O.lf one or more clips are incorrectly installed, replace the blade immediately. Make an entry in the helicopter records to indicate that ASB 47-08-25 was accomplished and the blade was found unserviceable. Submit a complete MMIR to BHTI Warranty Department for a replacement blade.ASB 47-08-25 Page 6 of 6

Figure 1 View from tip (Clips correctly installed) Area to be inspected on aft side of box beam

FIGURE 3 BLADE SECTION VIEW (CLIP INCORRECTLY INSTALLED) Figure 2 View from root (Clips correctly installed)