ALERT SERVICE BULLETIN

407-18-116 22 February 2018

MODEL AFFECTED:

407

SUBJECT:

EXTERNAL POWER RECEPTACLE CABLE ASSEMBLIES, ONE-TIME TORQUE CHECK OF

HELICOPTERS AFFECTED:

Serial numbers 54652 through 54679, 54685 through 54697, 54699, 54700, 54702 through 54707, 54717, 54719, 54721, 54727, and 54729. [Serial number 54805 and subsequent will have the intent of this bulletin accomplished prior to delivery.]

COMPLIANCE:

Within 100 flight hours or 90 days, whichever occurs first.

DESCRIPTION: Bell Helicopter has become aware that some 407s may have been manufactured with the improper torque applied to the retaining nuts of the external power receptacle cable assemblies. This Alert Service Bulletin (ASB) provides the instructions to perform a onetime torque check of the retaining hardware of the subject cable assemblies. Instructions for removal, installation, and inspection of the external power receptacle and associated cables will be introduced to a future revision of the BHT-407-MM Maintenance Manual. APPROVAL: The engineering design aspects of this bulletin are Transport Canada Civil Aviation (TCCA) approved. CONTACT INFO: For any questions regarding this bulletin, please contact: Bell Helicopter Product Support Engineering - Light Helicopters Tel: 450-437-2862 / 1-800-363-8023 / [email protected] MANPOWER: Approximately 0.5 man-hours are required to complete this bulletin. This estimate is based on hands-on time and may vary with personnel and facilities available. ASB 407-18-116 Page 1 of 4 Approved for public release.

WARRANTY: There is no warranty credit applicable for parts or labor associated with this bulletin. MATERIAL: Required Material: None required. Consumable Material: None required. SPECIAL TOOLS: None required. WEIGHT AND BALANCE: Not affected. ELECTRICAL LOAD DATA: Not affected. REFERENCES: BHT-407-IPB, Illustrated Parts Breakdown BHT-407-MM, Maintenance Manual BHT-ALL-SPM, Standard Practice Manual PUBLICATIONS AFFECTED: BHT-407-MM, Maintenance Manual, Chapter 96. ACCOMPLISHMENT INSTRUCTIONS: 1. Prepare the helicopter for maintenance. 2. Disconnect helicopter battery. 3. Remove landing light panel (BHT-407-IPB, Chapter 53, Figure 53-24A, Item 18 and BHT-407-MM). 4. From the aft side of the external power receptacle (1), slide nipples (3) down on each of the two cable assemblies to gain access to the nuts (2) (Figure 1). ASB 407-18-116 Page 2 of 4 Approved for public release.

5. Visually inspect the attaching hardware and surrounding structure for any signs of damage. a. If damage is found, or if in doubt, contact Product Support Engineering for guidance prior to completing the remainder of the steps below. b. If no damage is noted continue to step 6. -NOTEIt will be required to note and record any movement of the attachment nuts (Y) for reporting purposes in later steps. 6. To perform the torque check, use an appropriate torque wrench and apply 10 footpounds (13.0 Nm) of torque to the nuts (2) (BHT-ALL-SPM, Chapter 2). 7. Slide nipples (3) up on cable assemblies to cover attaching hardware and nuts (2). 8. Install landing light panel assembly removed in step 3 (BHT-407-MM). 9. Connect helicopter battery. 10. Provide the following [email protected] :

information

to

Product

Support

Engineering

at

a. Serial number of the helicopter affected. b. Date of ASB accomplishment. c. Company name. d. Contact name. e. Contact information (address, phone number, email, etc…). f. If there was movement of the nuts while applying the required torque, on which one, and by how much did it turn (Example: ¼ of a turn or ½ a turn). If there was no movement of the nuts please note that in the provided information. 11. Make an entry in the helicopter logbook and historical service records indicating findings and compliance with this Alert Service Bulletin.

ASB 407-18-116 Page 3 of 4 Approved for public release.

Figure 1 – External Power Receptacle and Cable Assemblies – Typical Installation ASB 407-18-116 Page 4 of 4 Approved for public release.