SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 1 of 8 

1. Planning Information

A. Effectivity 

This Service Bulletin is applicable to the D-LOK Hook Assembly Lifesaving Systems, 

part number 410-A, installed on Goodrich Hoist Assemblies. The affected D- LOK Hook 

Assembly Lot Numbers are 208 and 1108. Refer to Table 1 for the affected Goodrich 

Hook Kit Assemblies and Rescue Hoist Assemblies. 

Table 1. Affected Hook and Hoist Assemblies

Lifesaving Systems 

Part Number 

Goodrich 

Hook Kit Assembly 

Part Number 

Goodrich 

Rescue Hoist 

Assembly 

Part Number 

410-A 44316-440 44316-12-101 

410-A 42315-789 44316-10-101 

42325-12 Series 

42325-14 Series 

42325-16 Series 

42325-18-1 

410-A 44311-400 44311-10 Series 

The D- LOK Hook, Lifesaving Systems part number 410-A, is a commercially available 

hook that can be procured from suppliers other than Goodrich. This Service Bulletin is 

limited to only those D- LOK Hooks that have been purchased directly from Goodrich. 

Refer to Table 2 for the list of affected D- LOK Hooks by Serial Number that are subject 

to this Service Bulletin. 

Table 2. Affected Hook Part Numbers and Serial Numbers 

Lifesaving Systems 

Part Number Lot Numbers Serial Numbers 

410-A Lot 208 592 – 599 

600 – 601 

603 – 633 

635 – 637 

640 – 642 

645 – 648 

650 – 654 

656 – 663 

665 – 666 

668 – 684 

686 – 687 
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 2 of 8 

Table 2. Affected Hook Part Numbers and Serial Numbers (continued) 

Lifesaving Systems 

Part Number Lot Numbers Serial Numbers 

410-A Lot 208 689 – 690 

694 

696 – 697 

699 – 701 

704 – 711 

713 – 726 

728 – 730 

732 – 743 

745 – 752 

754 – 758 

760 – 761 

763 – 764 

768 

770 – 777 

779 – 781 

783 – 784 

410-A Lot 1108 786 – 796 

799 – 811 

813 – 823 

825 – 830 

832 – 839 

841 – 847 

850 – 858 

860 – 861 

863 – 867 

869 – 871 

B. Reason 

The D- LOK Hook Supplier incorporated a change in the manufacturing process from a 

forging to a casting. This manufacturing process change is categorized as a major 

change and requires specific Non-Destructive Testing (NDT) on all of the cast hooks. 

The required NDT was not performed on the cast hooks prior to their introduction into 

service. As a result, all of the cast D- LOK Hooks are being recalled from service to be 

returned and replaced with compliant hooks. 

There are currently no reported failures of the cast hook and initial test results from 

Goodrich have revealed a large margin of safety in the cast hooks. 

C. Description 

This Service Bulletin provides the instructions to inspect the D- LOK Hook part number 

410-A to determine if it is a cast hook from the affected lot. 
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 3 of 8 

Goodrich will replace any Lifesaving Systems part number 410-A cast D- LOK Hook that 

is removed from service as a result of this service bulletin with either a Lifesaving 

Systems part number 410-A forged D-LOK Hook, a Goodrich PN 42315-489 cast DLOK Hook, or a Goodrich PN 42305-283 Marine Hook, as appropriate for the aircraft 

installation. Goodrich will provide these replacement hooks free of charge provided that 

the cast part number 410-A hook is returned to Goodrich. 

D. Compliance 

This Service Bulletin is only applicable to the D- LOK Hook Lifesaving Systems part 

number 410-A and marked with Lot number 208 or 1108 (see Figure 1). 

NOTE: Some hook assemblies may have already been visually inspected and marked 

with (V-OK) on the side of the hook (see Figure 1). The visual inspection that 

was performed is NOT an indication that the hook has been processed through 

NDT. All D- LOK Hooks with Lifesaving Systems part number 410A from Lot 208 

and Lot 1108 are subject to this recall in accordance with this Service Bulletin 

including those hooks with (V-OK) marked on them. 

Goodrich Corporation recommends this inspection be performed and affected hooks be 

replaced within 500 total hoist cycles or 200 hoist cycles from the date of the 

Airworthiness Directive that specifies the performance of this service bulletin, or by 

September 30, 2009, whichever occurs first. 

E. Approval 

This Service Bulletin contains no modification information that revises the approved 

configuration. This modification is in compliance with the existing FAA and EASA 

approved configuration. 

F. Manpower 

(1) The estimated amount of labor to accomplish the instructions of this Service Bulletin 

for one cast D- LOK Hook assembly is 30 minutes, as follows: 

Remove Hook Assembly 10 minutes 

Inspection 10 minutes 

Install Hook Assembly 10 minutes 

(2) The one-time visual inspection described in this Service Bulletin may be performed 

by Hoist Operators/Users, Goodrich Corporation Sensors and Integrated Systems, or 

by personnel and facilities officially authorized by Goodrich Corporation Sensors and 

Integrated Systems. 

G. Material — Cost and Availability 

Goodrich will replace any Goodrich-provided cast D-LOK Hook part number 410-A with a 

compliant forged D-LOK Hook part number 410-A, or a compliant Marine Hook part 

number 42305-283, or a compliant Slide Lock Hook part number 42315-490 in 

accordance with this Service Bulletin at no charge to the customer provided the 

customer return their cast D-LOK Hook part number 410-A.
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 4 of 8 

The following table lists the material required to accomplish the replacement of a cast DLOK Hook part number 410-A with a forged D- LOK Hook part number 410-A, or Marine 

Hook part number 42305-283, or a Slide Lock Hook part number 42315-490 in 

accordance with the instructions of this Service Bulletin. The specific replacement hook 

and associated hook nut is dependent on the specific platform hoist installation and will 

be determined as part of the Return Material Authorization (RMA) process with the 

customer. 

NEW P/N DESCRIPTION OLD P/N QTY 

410-A 

or 

42305-283 

Or 

42315-490 

D- LOK Hook Assembly, Forged 

or 

Marine Hook 

 or 

Slide Lock 

(dependent on platform installation) 

410-A 

Lot 208 

 or 

Lot 1108 

1 

42305-298 

or 

44301-404 

Hook Nut 

(dependent on platform installation) 

--- 1 

MS39086-494 Spring Pin --- 1 

147577 Loctite No. 243 for a D-LOK Hook --- AR 

H. Material Availability 

None. 

I. Tooling - Price and Availability 

None. 

J. Weight and Balance 

Not affected. 

K. Electrical Load Data 

Not affected. 

L. Software Accomplishment Summary 

None. 

M. Reference 

Goodrich Corporation applicable rescue hoist Component Maintenance Manual (CMM), 

1st Maintenance Level. 

N. Other Publications Affected 

None. 
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 5 of 8 

2. Accomplishment Instructions

NOTE: All D- LOK Hooks are subject to this one-time inspection including those 

installed on-aircraft as well as those in spares inventory. 

A. Prepare for visual inspection. If the hook is currently installed on a hoist mounted to an 

aircraft, perform the following steps as required to gain access to the hook to inspect the 

part number, lot number and serial number: 

(1) Apply power to the rescue hoist system and extend cable assembly 

approximately 3 feet (1.0 m) to gain access to the hook for inspection. 

(2) Set the rescue hoist power source OFF. 

B. Visually inspect the D- LOK Hook for part number 410-A and Lot number 208 or Lot 

number 1108 (see Figure 1). Note the hook serial number, it will be required to return 

the hook to Goodrich for replacement. 

C. If the D- LOK Hook part number is 410-A and the lot number is Lot 208 or Lot 1108, then 

the hook is subject to the recall and replacement. If the hook is not part number 410-A 

or is not from Lot 208 or Lot 1108, then it is not subject to the recall and no further action 

is required. 

D. To remove a hook that is currently installed on a Goodrich hoist, refer to the 

corresponding Component Maintenance Manual (CMM) listed in the table below for the 

hook assembly removal and installation procedures. 

HOOK KIT CMM 

42315-789 25-00-01-1 

25-00-16-1 

25-00-17-1 

25-00-19-1 

25-00-18-1 

44316-440 25-00-30-1 

E. Inspection 

Visually inspect the D- LOK Hook for part number 410-A and Lot 208 or Lot 1108 (see 

Figure 1). Note the hook part number, lot number, and serial number; this information 

will be required to return the hook to Goodrich for replacement. 

NOTE: Contact Joe Rumolo at Goodrich directly for any technical questions. Refer to 

Paragraph 2.H. for contact information. 

F. Testing 

None. 

G. Marking 

None. 
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 6 of 8 

H. Point of Contact 

To arrange for return of cast D- LOK Hooks for warranty replacement, contact Goodrich 

Corporation Customer Service at the address listed below: 

Goodrich Corporation, 

Sensors and Integrated Systems 

Diamond Bar, California 91765 

Attn: Jennette Ness 

Phone: 909-569-0210 

FAX: 909-569-0387 

A Return Material Authorization (RMA) number is required from Goodrich Corporation 

prior to shipment of the unserviceable hook assembly. Goodrich Corporation will require 

the hook part number, lot number, and serial number to establish the RMA. 

For Technical Questions: 

Goodrich Corporation, 

Sensors and Integrated Systems 

Diamond Bar, California 91765 

Attn: Joe Rumolo 

Phone: 909-569-0231 

FAX: 909-569-0387 

3. Material Information

A. The parts required to modify one unit are itemized below: 

NEW 

P/N QTY DESCRIPTION OLD 

P/N INSTRUCTIONS/DISPOSITION 

410-A (Forged) 

or 

42305-283 

Or 

42315-490 

1 D- LOK Hook Assy, Forged 

or 

Marine Hook 

Or 

Slide Lock 

(dependent on platform 

installation) 

410-A 

Lot 

208 or 

Lot 

1108 

Return cast D- LOK Hook part 

number 410-A to Goodrich. 

42305-298 

or 

44301-404 

1 Hook Nut 

(dependent on platform 

installation) 

---- Replace old Hook Nut with new 

Hook Nut provided. Discard old 

Hook Nut. 

MS39086-494 1 Spring Pin ---- Replace old Spring Pin with new 

Spring Pin provided. Discard 

old Spring Pin. 

147577 AR Loctite No.243 for a D-LOK Hook ---- Apply to the end threads on 

replacement hook as shown in 

Figure 2. 
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 7 of 8 

Goodrich

Visual

Inspection

Stamp

Hook

Lot

Number

Hook

Serial

Number

Lifesaving

Systems

Hook

Part

Number

Figure 1. Sample D- LOK Hook Assembly with Visual Inspection Stamp 
SERVICE BULLETIN 

Equipment/Furnishings – D-LOK Hook Assembly 

Rev. - 42315-489-02 

14 Aug 2009 Page 8 of 8 

Figure 2. Apply Loctite To Hook Assembly Thread