H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness

AIRBUS H145 · Maintenance Manual

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Overview

This document provides Instructions for Continuing Airworthiness for the H145 D-3 Bear Paw Kit installed on Airbus H145 D-3 (BK117 D-3) rotorcraft. It includes maintenance procedures, airworthiness limitations, and removal and replacement instructions for the kit.

Applicable to Airbus H145 D-3 (BK117 D-3) models.
The Bear Paw Kit enhances stability during landings on soft terrain.
Scheduled inspections include daily checks and 200-hour/6-month torque checks.
Repairs to the items referenced are not permitted.
No airworthiness limitations are associated with the items in this document.
Installation instructions must follow standard aircraft practices.
Torque fasteners according to FAA guidelines.
Updates to the document will be provided free of charge upon request.

Document

Source

Originally published by alpineaerotech.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

View original at alpineaerotech.com

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Document details

Type: Maintenance Manual
Year: 2025
File size: 609 KB
Publisher: alpineaerotech.com
Language: en

Specifications & performance

Extracted from this document.

Specifications

Lateral arm mm: 0.00
Longitudinal arm mm: 5159
Bear paw kit weight kg: 9.58
Bear paw kit weight (lb): 21.12

Weight & balance

Lateral arm mm: 0.00
Longitudinal arm mm: 5160
Bear paw kit weight kg: 9.15
Bear paw kit weight (lb): 20.17

About this document

What is the H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness?

The H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness is a maintenance manual for the AIRBUS H145, dated 2025.

Where does the H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness come from?

This copy of the H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness was originally published by alpineaerotech.com and is hosted on Sprinkle as a free, searchable reference copy.

What year was the H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness published?

The H145 D-3 Bear Paw, Kit Instructions for Continuing Airworthiness — the AIRBUS H145 maintenance manual on file — is dated 2025.

Documentation completeness

2/7

Most owners only have the POH. Here's the essential set for the AIRBUS H145.

Pilot's Operating Handbook / AFM
Checklist
Maintenance Manual
Parts Catalog (IPC)
Systems & Wiring
Service Bulletins on file
Type Certificate (TCDS)

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In this document

Introduction

This section outlines the purpose of the document, which is to provide continuing airworthiness instructions for the H145 D-3 Bear Paw Kit.

Description

The Bear Paw Kit provides additional flotation to the skid gear, enhancing stability and reducing the risk of tail rotor strikes during landings on soft terrain.

Maintenance Manual Supplement

This section details the instructions for continuing airworthiness, repair allowances, and airworthiness limitations for the referenced items.

Airworthiness Limitations

There are no airworthiness limitations associated with the items referenced in this document, and it specifies maintenance required under FAA regulations.

Removal & Replacement Instructions

This section provides detailed steps for the removal and replacement of the Bear Paw Kit components.

Inspection Procedures

Inspection procedures include daily checks, torque checks every 200 hours or 6 months, and detailed inspections every 400 hours or 12 months.

Safety notes

Perform inspections prior to flight operations.
If damage is detected, refer to the Repair Procedures section.
Ensure the aircraft is safe and ready for maintenance before performing any work.
Apply thread-locker to threads as per manufacturer recommendations.
Torque fasteners to specified limits to ensure safety.

Full document text

Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 1 of 18 H145 D-3 BEAR PAW, KIT INSTRUCTIONS FOR CONTINUING AIRWORTHINESS MODELS: AIRBUS H145 D-3 (BK117 D-3) Read all of the Instructions for Continuing Airworthiness thoroughly prior to performing any activities relating to this product Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 2 of 18 Table of Contents Section Description Page 1 Introduction 2 2 Description 2 3 Maintenance Manual Supplement 3 4 Airworthiness Limitations 7 5 Removal & Replacement Instructions 8 Applicability 8 Weight & Balance 8 Removal Instructions 9 Replacement Instructions 11 6 Illustrated Parts Breakdown 14 Notes 1. If changes to this document are required, Alpine Aerotech LP shall revise all pages and reissue the entire document. 2. Alpine Aerotech LP shall make any subsequent revisions of this document available free of charge upon request. Alpine Aerotech LP also recommends that the end user of this product periodically verify the revision level of this document. SECTION 1 Introduction This document comprises Instructions for Continuing Airworthiness that apply to the AAL H145 D-3 Bear Paw, Kit installed on Airbus H145 D-3 (BK117 D-3) rotorcraft. The information and data contained in this document are supplemental to the information contained in the existing ICA for the H145 D-3 (BK117 D-3). SECTION 2 Description The following information provides a functional description of the H145 D-3 Bear Paw, Kit as defined in Alpine Aerotech LP authority dataset AAL-290-090-001. In soft terrain landing situations (i.e. tundra, snow and sand) where the skid tubes can sink into the landing area, balancing issues can occur and in rare cases the tail rotor can come in contact the ground. When installed, the Bear Paw, Kit provides additional flotation to the skid gear AFT of the aircraft’s C of G, therefore increasing stability and decreasing the potential of a tail rotor strike. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 3 of 18 SECTION 3 Maintenance Manual Supplement General Notes 1. The following information defines the instructions for continuing airworthiness, repair allowances and airworthiness limitations for the item(s) referenced within this document. 2. Refer to the current revisions of the Airbus H145 D-3 Aircraft Maintenance Manual and Master Servicing Manual for the chapter(s) and section(s) referenced within this document. 3. Refer to the Section 5: Removal & Replacement Instructions and Section 6: Illustrated Parts Breakdown for the replacement and/or installation of the item(s) referenced within this section. 4. Scheduled inspection for the item(s) referenced within this document shall be accomplished in accordance with (IAW) the Inspection Procedures specified. 5. Repair allowances for the item(s) referenced within this document shall be accomplished IAW the Repair Procedures specified. 6. Limitations for the item(s) referenced within this document are IAW the airworthiness limitations specified in Section 4: Airworthiness Limitations. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 4 of 18 Inspection Procedures Supplement to applicable Airbus H145 D-3 (BK117 D-3) Master Servicing Manual, Chapter 05 Notes 1. Refer to the applicable Airbus H145 D-3 (BK117 D-3) Master Servicing Manual, Chapter 05 as applicable, for general information on inspections, inspection definitions, inspection intervals, inspection methods and inspection schedules. 2. General Inspections, as indicated within this document, are defined as visual, non-thorough checks. 3. Detailed Inspections, as indicated within this document, are defined as visual and thorough, searching checks. 4. Perform Daily Inspections/Pilot Pre-flight Check every day, prior to flight operation. If damage or unsafe condition is detected, perform the 400 Hour/12 Month Inspections. 5. Perform 200 Hour/6 Month torque check every 200 hours or 6 months, whichever occurs first prior to flight operations. The approved inspection interval tolerance for the 200 Hour/6 Month torque check is a maximum of 10% 6. Perform 400 Hour/12 Month Inspections every 400 hours or every 12 months, whichever occurs first, prior to flight operation. If damage is detected, refer to the Repair Procedures section within this document. The approved inspection interval tolerance for the 400 Hour/12 Month Inspection is a maximum of 10%. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 5 of 18 Scheduled Inspections 1. Daily Inspections/Pilot Pre-flight Check Data Reference: Section 5: Removal & Replacement Instructions Section 6: Illustrated Parts Breakdown i. Perform a General Inspection on all items in the H145 D-3 Bear Paw, Kit for general condition. ii. Perform a General Inspection on all items in the H145 D-3 Bear Paw, Kit for proper security. iii. Visually confirm the condition of the Torque Lacquer on the fasteners securing the Bearpaw to the skid-tube. If Torque Lacquer is broken, perform the 200 Hour/6 Month torque check. 2. 200 Hour/6 Month torque check Data Reference: Section 5: Removal & Replacement Instructions Section 6: Illustrated Parts Breakdown i. Confirm that all Self-Locking Nuts (Item 11) common to the Strap Assys (Items 4 & 5) are torqued to 40 in/lbs. Add tare (drag) torque per standard aircraft practices as specified in AC43.13. ii. Apply fresh Torque Lacquer (Item 15), or equivalent, to fasteners common to the Strap, Assys (Items 4 & 5) IAW the manufacturer’s recommendations. 3. 400 Hour/12 Month Inspections Data Reference: Section 5: Removal & Replacement Instructions Section 6: Illustrated Parts Breakdown i. Perform a Detailed Inspection on all items, materials and finishes in the H145 D-3 Bear Paw, Kit for evidence of corrosion, cracks and damage. ii. Perform a Detailed Inspection on all items in the H145 D-3 Bear Paw, Kit for evidence of excessive wear. iii. Perform a Detailed Inspection on all items, materials and finishes in the H145 D-3 Bear

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Paw, Kit for proper integrity and condition. iv. Perform a Detailed Inspection on all hardware and fasteners in the H145 D-3 Bear Paw, Kit for proper condition, security and torque. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 6 of 18 Repair Procedures 1. Repairs to the item(s) referenced within this document are not permitted. Contact Alpine Aerotech LP for further information if repairs are required to the item(s) referenced within this document. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 7 of 18 SECTION 4 Airworthiness Limitations Supplement to applicable Airbus H145 D-3 (BK117 D-3) Master Servicing Manual, Chapter 04, Airworthiness Limitations Notes 1. Refer to the applicable Airbus H145 D-3 (BK117 D-3) Master Servicing Manual, Airworthiness Limitations Section, for general information on airworthiness limitations and airworthiness limitation schedules. 2. Item(s) not listed in the Scheduled Airworthiness Limitations section within this document have an unlimited airworthiness life. Scheduled Airworthiness Limitations 1. There are no airworthiness limitations associated with the item(s) referenced within this document. The Airworthiness Limitations section is FAA approved and specifies maintenance required under Sections 43.16 and 91.403 of the Federal Aviation Regulations unless an alternative program has been FAA approved. The Airworthiness Limitations section is approved by the Minister and specifies maintenance required by any applicable airworthiness or operating rule unless an alternative program has been approved by the Minister. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 8 of 18 SECTION 5 Removal & Replacement Instructions Applicability The H145 D-3 Bear Paw, Kit (AAL-290-090-001) is applicable to all H145 D-3 (BK117 D-3) serial numbers. Weight & Balance Part Number Description Weight Long. Arm Lat. Arm AAL-290-090-001 Bear Paw, Kit † 21.12* 203.11 0.00 9.58 (Kg) 5159 (mm) 0.00 (mm) AAL-290-090-001 Bear Paw, Kit ‡ 20.17* 203.15 0.00 9.15 (Kg) 5160 (mm) 0.00 (mm) † Applicable to installations with Grippers (Item 7) and associated hardware ‡ Applicable to installations without Grippers (Item 7) and associated hardware * Total increase in weight to aircraft. General Notes 1. All Installation Instructions shall be accomplished in accordance with (IAW) standard aircraft practices. Refer to the current revision of the FAA Advisory Circular AC 43.13-1 and AC 43.13- 2 for details on standard aircraft practices. 2. Torque fasteners IAW the tension type torque limits indicated in the current revision of the FAA Advisory Circular AC 43.13-1, Table 7-1 unless otherwise specified. 3. All Dimensions are in imperial measures (inches/pounds) unless otherwise specified. 4. Refer to Section 3: Maintenance Manual Supplement for instructions on maintenance for the item(s) referenced within this section. 5. Refer to Section 6: Illustrated Parts Breakdown for the part numbers of the item(s) referenced within this section. Installation Notes Typical item number for all like items in this view unless otherwise specified. Apply Thread-locker (Item 14) to threads IAW manufacturer’s recommendations (prior to torquing fastener). Torque to 30-35 INCH LBS. Apply Torque Lacquer (Item 15), or equivalent to, all fasteners common to the Strap, Assys (Items 4 & 5) IAW manufacturer’s recommendations. 1 2 3 Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 9 of 18 Removal Instructions 1. Gain access to the aircraft and make the aircraft safe and ready for maintenance. Figure 1 LHS Shown, RHS Opposite 2. Remove the Strap, Assys (Items 4 & 5), Cap, Details (Items 2 & 3) and the associated Nuts (Item 11) and Radius Washers (Item 9). Raise the aircraft and remove the Bear Paw, Detail (Item 1) from under the skid tube. Reference Figure 1. 3. Repeat removal steps on the RHS. Reference Figure 1. Removal complete. 4. Update the aircraft logbook for the removal of the H145 D-3 Bearpaw, Kit. 3 1 4 1 11 5 1 CROSS TUBE SADDLE FITTING REF UP OUTBD FWD ISOMETRIC VIEW INSTALLATION SHOWN OEM SKID TUBE REF 1 2 9 1 3 3 Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 10 of 18 Removal Instructions - Grippers 1. Removal of the Grippers (Item 7) can be performed with the Bear Paws (Item 1) installed on the aircraft or on the bench. If removing Grippers while installed on the aircraft, raise the aircraft and make it safe and ready for maintenance prior to proceeding. Reference Figure 2. Figure 2 Gripper Removal/Replacement 2. Remove Bolts (Item 13), Washers (Item 12) and Grippers (Item 7) from Bearpaw, Detail (Item 1). Reference Figure 2. 3. Removal Complete. Update the aircraft logbook and Weight & Balance for the removal of the Grippers (Item 7). 1 7 2 12 1 13 2 1 Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 11 of 18 Replacement Instructions 1. Gain access to the aircraft and make the aircraft safe and ready for maintenance. 2. Raise the aircraft and position the Bear Paw, Detail (Item 1) under the skid tube. Reference Figure 1. 3. Once the Bear Paw, Detail (Item 1) is under the skid tube in its approximate location, position the Strap, Assys (Items 4 & 5) and their respective Cap, Details (Items 2 & 3) on their corresponding bolts. Reference Figure 1. NOTE: Ensure the Aft-most Strap, Assy (Item 4) and associated Cap, Detail (Item 3) are positioned between the cross-tube saddle fitting and the existing bolt at the aft end of the skid tube. Reference Figure 1. Figure 3 Hardware Orientation Shown 11 9 4 RADIUS EDGE DOWN 5 OR Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 12 of 18 Replacement Instructions 4. Install the supplied Radius Washer (Item 9) and Nut (Item 11) on each bolt. Reference Figures 1 & 3. Ensure the radius edge on the Washer (Item 9) is oriented down and towards the skid tube. Reference Figure 3. A thin-wall socket may be required to adequately fasten the Nut (Item 11). NOTE: Do not apply final torque to the fasteners at this stage while the aircraft is raised off the ground. Only apply minimal torque to snug-up the Bear Paw, Detail (Item 1). You should be able to move the Bear Paw by hand. 5. Lower the aircraft onto the Bear Paw, Details (Item 1). After ensuring full aircraft weight on gear, torque the fasteners equally to 40 in/lbs. while ensuring the Strap, Assys (Items 4 & 5) sit roughly level. Add tare (drag) torque per standard aircraft practices as specified in AC43.13. Reference Figure 1. Apply Torque Lacquer (Item 15) or equivalent, to all fasteners common to the Strap, Assys (Items 4 & 5). 5. Replacement complete. Perform a General Inspection of all items to ensure proper installation. 6. Update the aircraft logbook for the installation/replacement of the H145 D-3 Bearpaw, Kit. Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 13 of 18 Replacement Instructions - Grippers 1. Replacement of the Grippers (Item 7) can be performed with the Bear Paws (Item 1) installed on the aircraft or on the bench. If removing Grippers while installed on the aircraft, raise the aircraft and make it safe and ready for maintenance prior to proceeding. Reference Figure 4. 2. Replace the Grippers (Item 7) and supplied hardware on the Bear Paw, Detail (Item 1) as shown. Ensure all serrated surfaces on the Grippers are facing down (serrations must be common to the ground). Ensure Thread-locker (Item 14) is applied (mandatory). Torque all Gripper fasteners IAW Flag-note 2. Reference Figure 4. NOTE: Installation of Grippers (Item 7) and associated hardware is optional. If Grippers are desired, all Grippers (8X) and associated hardware must be installed. Use applicable Weight & Balance information provided. If Grippers are not desired, all Grippers (8X) and associated hardware must be removed. Use applicable Weight & Balance information provided. Ensure Thread-locker (Item 14) is sufficiently applied to all Gripper fasteners. Omitting Thread-locker is not acceptable and will create a non-airworthy installation. 3. Replacement complete. Perform a General Inspection of all items to ensure proper installation. 4. Update the aircraft logbook for the replacement of the Gripper, Details (Item 7). CAUTION Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 14 of 18 SECTION 6 Illustrated Parts Breakdown General Notes 1. Alternate items listed where applicable. Typical item number for all like items in this view unless otherwise specified. Not shown and not provided. Procure locally. 1 2 Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 15 of 18 Illustrated Parts Breakdown (cont.) Bear Paw, Kit Shown (LHS only) 1 7 1 12 1 13 1 Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 16 of 18 Illustrated Parts Breakdown (cont.) Bear Paw, Kit Shown (LHS only) 10 1 8 1 6 1 1 11 1 Revision: NI Date: 2025-04-24 Doc. No.: AAL-290-095-701 Page 17 of 18 Illustrated Parts Breakdown (cont.) 4 9 7 5 2 3 Revision: NI Date: 2024-09-24 Doc. No.: AAL-390-035-701 Page 18 of 18 Illustrated Parts Breakdown (cont.) ITEM QTY NUMBER DESCRIPTION MATERIAL REF STOCK SIZE SPEC FINISH MANUFACTURER NCAGEC - AAL-290-090-001 H145/D3 BEAR PAW, KIT ALPINE AEROTECH LP L0171 1 2 AAL-290-092-001 BEAR PAW, DETAIL UHMWPE NA NA NA ALPINE AEROTECH LP L0171 2 2 AAL-290-092-002 CAP, DETAIL UHMWPE NA NA NA ALPINE AEROTECH LP L0171 3 4 AAL-290-092-005 CAP, DETAIL UHMWPE NA NA NA ALPINE AEROTECH LP L0171 4 4 AAL-290-091-002 STRAP, ASSY NA NA NA NA ALPINE AEROTECH LP L0171 5 2 AAL-290-091-001 STRAP, ASSY NA NA NA NA ALPINE AEROTECH LP L0171 6 12 AAL-290-042-006 TAB, DETAIL NA NA NA NA ALPINE AEROTECH LP L0171 7 8 CL-16-SG SQUARE, GRIPPER M2 TOOL STEEL .375 x 1.000 x 1.000 SEE MFR SEE MFR CARR LANE MFG CO. 99862 8 12 Ø.3125-18 x 2.250 x 2.250 BOLT, ROUND HEAD, SQUARE NECK ASTM A307 GRADE A SEE SPEC ASME B18.5 ZINC PLATED SOURCE AS REQUIRED NA 9 12 NAS1401-5C3 WASHER, RADIUS SEE SPEC SEE SPEC NAS1401 SEE SPEC SOURCE AS REQUIRED NA 10 12 MS15795-812 WASHER, FLAT SEE SPEC SEE SPEC NASM15795 SEE SPEC SOURCE AS REQUIRED NA 11 24 Ø.3125-18, STYLE NE NUT, HEX, SELF LOCKING ASME B18.16.6 GRADE N2 SEE SPEC ASME B18.16.6 ZINC PLATED SOURCE AS REQUIRED NA 12 8 NAS1149F0432P WASHER, FLAT SEE SPEC SEE SPEC NAS1149 SEE SPEC SOURCE AS REQUIRED NA 13 8 AN4-10A BOLT, MACHINE SEE SPEC SEE SPEC NASM3THRU20 SEE SPEC SOURCE AS REQUIRED NA 14 1 LOCTITE 243 THREADLOCKER, MEDIUM STRENGTH LOCTITE 243 SEE MFR SEE MFR SEE MFR HENKEL LOCTITE CORPORATION 79436 15 AR C83317 TORQUE LACQUER DYKEM CROSS CHECK SEE MFR SEE MFR YELLOW ITW PRO BRANDS 1QZC4 2 2

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