Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies
ENSTROM F28F · Maintenance Manual
Overview
This document provides installation instructions for Airwolf Aerospace LLC Tension-Torsion Strap Assemblies in Enstrom F28/280 and TH-28/480 model series helicopters. It includes detailed steps for removing and installing various components, as well as notes on maintenance test flights and weight balance effects.
- Installation is for Tension-Torsion Strap Assemblies, P/N AA-ECD-084-280/-480.
- Applicable to Enstrom F28/280 and TH-28/480 model series helicopters.
- Includes detailed removal and installation procedures.
- No effect on rotorcraft weight and balance for both piston and turbine models.
- Maintenance test flight is required after installation.
- Log book entry is necessary after completing the installation.
Document
Source
Originally published by airwolfaerospace.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Maintenance Manual
- Year ·
- 2015
- File size ·
- 340 KB
- Publisher ·
- airwolfaerospace.com
- Language ·
- en
What is the Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies?
The Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies is a maintenance manual for the ENSTROM F28F, dated 2015.
Where does the Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies come from?
This copy of the Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies was originally published by airwolfaerospace.com and is hosted on Sprinkle as a free, searchable reference copy.
What year was the Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies published?
The Installation Instructions for Airwolf Aerospace LLC Tension – Torsion Strap Assemblies — the ENSTROM F28F maintenance manual on file — is dated 2015.
Most owners only have the POH. Here's the essential set for the ENSTROM F28F.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
More ENSTROM F28Fmanuals & documents
- ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1Maintenance Manual
- SERVICE INFORMATION LETTER NO. 0183Service Bulletins
- SERVICE DIRECTIVE BULLETIN 0053Service Bulletins
- Enstrom F-28F Flight ChecklistChecklist
- Tail Rotor Drive Shaft AlignmentMaintenance Manual
- Proper Servicing of the Fuel Screens on Enstrom F Series Piston Engine HelicoptersMaintenance Manual
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In this document
Introduction
The purpose of this report is to provide guidance on installing Tension-Torsion Strap Assemblies in Enstrom F28/280 & TH-28/480 helicopters.
Turbine Models, Lamiflex Bearing Configured Models
Details the removal and installation of parts from the Main Rotor Retention Assembly for turbine models.
Turbine Models, TT Strap Configured
Outlines the steps for removing and replacing the Tension-Torsion Strap Assembly in turbine models.
Piston Models (F28/280 Model Series)
Describes the removal and installation of parts for piston models, including the replacement of Lamiflex Thrust Bearings.
Weight & Balance Effect
States that the installation of the Tension-Torsion Strap Assemblies has no effect on rotorcraft weight and balance.
Log Book Entry
Instructs to document the completion of the installation in the log book.
Safety notes
- Seal the interface between Cylinder Assembly and Spindle Assembly with silicone.
- Perform a Maintenance Test Flight per Enstrom TH-28/480 Series Maintenance Manual Section 4-61 after installation.
Full document text
AIRWOLF AEROSPACE LLC 15369 Madison Rd. Middlefield, OH 44062-8404 U.S.A. (440) 632-1687 / (440) 632-1685 Fax www.airwolfaeospace.com / info@airwolfaerospace.com Installation Instructions For The Installation of Airwolf Aerospace LLC, Tension – Torsion [TT] Strap Assemblies, P/N AA-ECD-084-280 / -480 In Enstrom F28/280 & TH-28/480 Model Series Helicopters FAA Project: ST07957CH-R FAA STC Number: SR03465CH Report Number: AA-ECD-084-280/-480 Installation Prepared By: Joseph H. McGarvey, DER LOG OF REVISIONS REVISION DESCRIPTION OF REVISION DATE IR ............... Initial Release ............................................................................................ 01/20/15 A ................ Para. 2.3: AA-28-14279-3 [Was 28-14279-3] ..................................... 06/05/15 Para 4.2: AA28-14385-13 [Was 28-14385-13] AA28-14386-1 [Was 28-14386-1] B ................ Para 2.1 Deleted Rotor Blade Removal .............................................. 03/07/16 Para 2.2 28-14239 [Was 28-14236] Added 28-14240 Para 2.3 28-14382-19 [Was 28-14382] Deleted 28-14384-13 Added Note (1) Para 3.1 Totally rewritten with 3.1.1 thru 3.1.10 inclusive Para 3.2 Rewritten. Replaced with 3.2.1 thru 3.2.6 inclusive. Para 4.0 Added (F-28/280 Model Series) Para 4.1 28-14239-5 [Was 28-14235-5] NAS 1611-029 [Was 1811-029] Para 4.2 Deleted 28-14384-5 Added 28-16242-1 & SIL 0184 Added Note (1) C ................ Para 2.3 Note (1) ................................................................................ 10/30/16 28-14381-903 Spindle Assy [Was 28-14381-902] Para 3.2.5 Added 28-14381-903 Para 4.2 Added New Para 4.2 Para 4.3 Was prior Para 4.2 1.0 Introduction: The purpose of this report is to provide Owner/Operators guidance on how to install Airwolf Aerospace, LLC Tension-Torsion Strap Assemblies, PIN AA-ECD-084-280 & -480, in Enstrom F-28/280 & TH-28/480 Model Series Helicopters. 2.0 Turbine Models, Lamiflex Bearing Configured Models 2.1 Remove the Retention Assembly in accordance with Sections 9-14 of Enstrom TH- 28/480 Series Maintenance Manual. 2.2 Remove the below listed parts from the Main Rotor Retention Assembly, P/N 28-14234-909 in accordance with Enstrom TH-28/480 Series Maintenance Manual, Section 9-15A: Part Number Part Name Comment 28-14234-901.................... Spindle Assy. 28-14282-13...................... Spindle 28-14239 ........................... Dust Cover L-18X................................ Plug AN380-4-8 ........................ Cotter Pin 28-14335-1........................ Retention Nut 28-14239-7,-9,-11-,13 ....... Shims 28-14320-15...................... Lamiflex Bearing 28-14311-1........................ Nylatron Strip NAS1611-029 ................... O-Ring OR 2-029 ................................. O-Ring 28-14279-3........................ Grip Assy 28-14313-1........................ DU Washer RST-200............................ Retaining Ring 28-14240-1........................ Droop Stop Pad 2.3 Install the below listed parts, using new parts where necessary (See Enstrom TH28/480 Series Maintenance Manual, Table 9-2 for Serviceable Limits) , replacing the Lamiflex Bearing, Enstrom P/N 28-14320-15 ,with Airwolf Aerospace, LLC Tension - Torsion Strap Assy., P/N AA-ECD- 084-480 creating Main Rotor Retention Assembly, P/N 28-14381-3 in accordance with Enstrom TH-28/480 Series Maintenance Manual Section 9-188: Part Number Part Name Comment 28-14381-903.................... Spindle Assy ................. Use w/ 28-14381-3 Retention Assy 28-14240-1........................ Droop Stop Pad CR17240 ........................... Seal MS16555-27 ..................... Pin 28-14386-5........................ Grip Assy OR AA-28-14279-3 Grip Assy ...................... Modified by Airwolf per APS-480-2 Required Becoming AA-28-14279-3 AA-ECD-084-480............. TT Strap Assy 28-14381-902.................... Cylinder Assy. 28-18382-21...................... Pin 28-14381-901.................... Lug Assy AN3-12A .......................... Bolt AN960-10 & 10L .............. Washers 28-14382-19...................... Pin VH-75 ............................... Retaining Ring NOTES: 1. Seal the interface between P/N 28-14381-902 Cylinder Assy and 28-14381-903 Spindle Assy with silicone. 2. Upon Completing, perform a Maintenance Test Flight per Enstrom TH-28/480 Series Maintenance Manual Section 4-61. 3.0 Turbine Models, TT Strap Configured NOTE: TT Strap equipped Turbine Models are configured with either of two (2) Retention Assemblies: P/N 28-14381-1, or 28-14381-3. 3.1 Remove the below listed parts from the Main Rotor Retention Assembly .P/N 28- 14381-1 or -3 as follows: 3.1.1 Remove the Retention Assembly in accordance with Section 9-14 of Enstrom TH-28/480 Series Maintenance Manual. 3.1.2 Remove 28-14239-1 Cover Assy. 3.1.3 Remove one (1) VH-75 Retaining Ring 3.1.4 Remove 28-14382-19 Pin & remaining VH-75 Retaining Ring 3.1.5 Remove silicone sealant between 28-14381-902 Cylinder Assembly and 28-14234- 901 Spindle Assembly. 3.1.6 Insert a device (1/4" diameter punch or similar) into the outboard TT Strap bore to leverage it out from the inboard end of the Spindle Assy. NOTE: It is not necessary to remove the Grip from the Spindle 3.1.7 Remove the ECD-084-1 T-T Strap Assy. from the Spindle Assy. 3.1.8 Remove 28-14-382-21 Pin from 28-14381-902 Cylinder Assy., and remove Cylinder Assy. from the end of ECD-084-1 T-T Strap. Assy. 3.1.9 Inspect the Spindle Assy, Cylinder Assy, Lug Assy. & Pins in accordance with Table 9-2 of Enstrom TH-28/480 Series Maintenance Manual. 3.1.10 Coat the bore of the Spindle Assy. with primer as required. 3.2 Reinstall or replace with new parts as necessary (See Enstrom TH-28/480 Series Maintenance Manual, Table 9-2 for Serviceable Limits) , the above listed parts in the Main Rotor Retention Assembly, P/N 28-14381-1 or 28-14381-3 replacing the Enstrom T-T Strap Assy. P/N ECD-084- 1, with Airwolf Aerospace, LLC T-T Strap Assy., P/N AA-ECD-084-480 as follows:
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3.2.1 Install the Airwolf Aerospace LLC TT Strap Assy, P/N AA-ECD-084-480 Into the Spindle Assy Bore. NOTES (1) TT Strap Assy should slide freely without binding into the Spindle Assy. (2) The orientation of the TT Strap Assy (tag location) is not critical. 3.2.2 Assemble Cylinder Assembly, P/N 28-14381-902 and AA-ECD-084-480, TT Strap Assy. with 28-14382-21, Pin. Ensure that the groove of the Cylinder Assy. will align with MS16555-27 Pin. 3.2.3 Push the T-T Strap Assy. into the Spindle Assy. until firmly seated. 3.2.4 Install 28-14382-21, Pin & VH-75 Retaining Rings. 3.2.5 Seal the interface between 28-14381-902 Cylinder Assembly and 28-14381 903 Spindle Assembly with silicone. 3.2.6 Install the Retention Assembly in accordance with Section 9-19 of Enstrom TH-28/480 Series Maintenance Manual. NOTE: Upon completion perform a Maintenance Test Flight per Enstrom TH-28/480 Maintenance Manual Section 4-61. 4.0 Piston Models (F28/280 Model Series) 4.1 Remove the below listed parts from the Main Rotor Retention Assembly P/N 28-14234-9 in accordance with Enstrom F-28F and 280F Series Maintenance Manual Section 9-2A: Part Number Part Name Comment 28-14234-9........................ Retention Assy 28-14234-901.................... Spindle Assy 28-14282-11...................... Spindle OR 28-14282-13...................... Spindle 28-14240-1........................ Droop Stop Pad 28-14239-5........................ Dust Cover L-18X................................ Plug 28-14311-1........................ Nylatron Strip 28-14313-1........................ DU Washer 2-029 ................................. O-Ring OR NAS1611-029 ................... O-Ring 28-14279-1........................ Grip Assy or 28-14279-3........................ Grip Assy 28-14320-15...................... Lamiflex Thrust Bearing 28-14293-7, -9, -11, -13 .... Shims 28-14335-1........................ Retention Nut AN380-4-8 ........................ Cotter Pin 4.2 Remove the below listed parts from the Throttle Correlator Assembly, if so equipped (Refer to Enstrom F-28/280 Series Illustrated Parts Catalog (IPC) Figure 3-11) Part Number Part Name Comment MS24586C234 .................. Spring ............................ Qty 2, Item 480. [The inside Springs in the inboard And outboard spring sets.] 4.3 Install the below listed parts using new parts where necessary (See Enstrom TH- 28/480 Maintenance Manual Table 9-2 for Serviceable Limits), replacing the Enstrom Lamiflex Thrust Bearing, P/N 28-14320-15, with Airwolf Aerospace , LLC Tension- Torsion Strap Assy., P/N AA-ECD-084-280 creating Main Rotor Retention Assembly, P/N 28-14381-3. Perform installation in accordance with Enstrom TH-28/480 Maintenance Manual Section 9-18C: Part Number Part Name Comment AA-28-14385-13............... Spindle .......................... 28-14282-11 or 28-14282-13, Modified by Airwolf per APS-480-2 to AA-28-14385-13 OR 28-14385-13...................... Spindle 28-14385-15...................... Spindle 28-16242-1........................ Collective Trim-Rod ..... For all “F” Models and any Throttle Capsule Assy Correlator configured model. Install per Service Information Letter SIL 0184. 28-14280-1........................ Droop Stop Pad CR17240 ........................... Seal MS16555-27 ..................... Pin 28-14386-5........................ Grip Assy Part Number.................... Part Name Comment OR AA-28-14386-1................. Grip Assy ...................... Grip 28-14279-1 or 28-14279-3 Modified by Airwolf per APS-480-1\ to AA-28-14386-1. AA-ECD-084-280............. TT Strap Assy 28-14381-902.................... Cylinder Assy 28-14382-21...................... Pin 28-14381-901.................... Lug Assy AN3-12A .......................... Bolt AN960-10 & 10L .............. Washers 28-14382-19...................... Pin VH-75 ............................... Retaining Ring NOTES: (1) Seal the interface between 28-14381-902, Cylinder Assy. & 28-14381- 903 Spindle Assy. with silicone before proceeding to Section 19, Installation. (2) Upon completion perform Maintenance Test Flight per Enstrom TH-28/480 Series Maintenance Manual Section 4-61. 5.0 Weight & Balance Effect 5.1 Piston Models: Installation of the Airwolf Aerospace, LLC Tension-Torsion Strap Assemblies , P/N AA-ECD-084-280 and replacing the Enstrom Lamiflex Bearings, P/N 28-14320-15 & their associated hardware have no effect on rotorcraft weight and balance. 5.2 Turbine Models: Installation of the Airwolf Aerospace LLC Tension-Torsion Strap Assemblies, P/N AA-ECD-084-480 replacing Enstrom Lamiflex Bearing, P/N 28-14320-15 have no effect on rotorcraft weight & balance. 6.0 Log Book Entry: Make a Log Book entry documenting the completion of this installation