~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 of this bulletin. 

PART II: For main rotor blades installed on a 

helicopter, a One-time ferry flight not to 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 of this bulletin are FAA I DER approved. 

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER 

,. 

,. 

,. 

,. 

,. 

,. 

,. 

".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 of this 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 of this 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 of this bulletin. Should inspection 

reveal that one or more of the 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 VISTA warranty 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 of the 

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 of this bulletin and can 

be obtained through your Bell Helicopter Textron Supply Center. 

Part Number 

04 7-11 0-250-021 

04 7-11 0-250-023 

Nomenclature 

Blade 

Blade 

Quantity 

AIR 

AIR 
Consumable 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-308 
ASB 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 of the blade. 

4. Figures 1 and 2 show box beam clips correctly installed, while Figure 3 shows a 

clip installed incorrectly. 

5. If the 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 of the blade. 

5. Figures 1 and 2 show box beam clips correctly installed, while Figure 3 shows a 

clip installed incorrectly. 

6. If the 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. 

1 O.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)