SERVICE BULLETIN SB 25-006 B

GUIMBAL CABRI G2 · Service Bulletins

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Overview

This document is a service bulletin for the Guimbal Cabri G2 helicopter, detailing the mandatory relocation of the ELT antenna due to weak signal reports. It includes required materials, actions for installation, and guidelines for aircraft equipped and not equipped with VHF2 antennas.

Applicable to Cabri G2 S/N 1003 to S/N 1389, excluding 1383 and 1388.
Relocation of the ELT antenna is mandatory due to weak signal issues.
Deadline for compliance is 6 months from June 19th, 2026.
Associated Airworthiness Directive is EASA AD 2025-0282.
Required materials include ELT coaxial cable and antenna brackets.
Instructions provided for both VHF2 equipped and non-equipped aircraft.
Includes steps for engine cowl honeycomb repair if necessary.
Final steps include testing the ELT after installation.

Document

Source

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

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Document details

Type: Service Bulletins
Year: 2025
File size: 1.1 MB
Publisher: regulations.gov
Language: en

About this document

What is the SERVICE BULLETIN SB 25-006 B?

The SERVICE BULLETIN SB 25-006 B is a service bulletins for the GUIMBAL CABRI G2, dated 2025.

Where does the SERVICE BULLETIN SB 25-006 B come from?

This copy of the SERVICE BULLETIN SB 25-006 B was originally published by regulations.gov and is hosted on Sprinkle as a free, searchable reference copy.

What year was the SERVICE BULLETIN SB 25-006 B published?

The SERVICE BULLETIN SB 25-006 B — the GUIMBAL CABRI G2 service bulletins on file — is dated 2025.

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In this document

Applicability

This service bulletin applies to Cabri G2 helicopters with serial numbers from 1003 to 1389, excluding 1383 and 1388.

Required Actions

The document outlines the steps for removing the existing ELT antenna and installing the new antenna bracket and antenna.

Required Material

Lists the parts and tools needed for the antenna relocation, including coaxial cables and brackets.

Engine Cowl Honeycomb Repair

Describes the procedure for repairing the honeycomb structure if drilling interferes with it.

Flight Manual Temporary Revision

Instructions for removing a temporary revision from the flight manual if applicable.

Final Steps

Details the final steps to reinstall the ELT and perform necessary tests to ensure functionality.

Safety notes

Caution: Composite repair material for aircraft not equipped with VHF2 are not included in the associated kit.
Note: Ensure a 2 mm gap between the antenna and the composite during installation.
Note: Use care when removing upholstery as it is fragile.
Note: If AC is installed, remove the aft bulkhead prior to routing the coax cable.

Full document text

SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 1 / 17 Applicability Cabri G2 from S/N 1003 to S/N 1389 except 1383 and 1388. Situation HG has had reports of weak ELT signals when transmitting. Testing has showed that the root cause was the location of the ELT antenna. This Service Bulletin depicts the relocation of the ELT antenna and, if applicable, of the VHF2 antenna as well. SERVICE BULLETIN SB 25-006 B MANDATORY RECOMMENDED OPTIONAL REPAIR Subject ELT Antenna Relocation Date of Entry into Force December 12th; 2025 Deadline 6 months from the effective date of the associated AD (June 19th, 2026) Associated Airworthiness Directive EASA AD 2025-0282 Associated Modification / Repair MOD 25-010 / 25-022 Impact on Weight and Balance N/A HG Contact Customer Support Tel: +33 (0)4 42 39 10 88 E-Mail: support@guimbal.com Revision Subject Date A Creation Oct. 10th 2025 B AD reference added, non-structural honeycomb engine cowl repair, minor improvements. Dec. 12th; 2025 SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 2 / 17 Cabri G2 SERVICE BULLETIN Required Material Aircraft equipped with VHF2 Reference Designation Qty Part Cons. Tool. G71-40-220 ELT Coaxial Cable 1 ● G72-03-220 VHF2 Antenna Bracket 1 ● G72-03-242 ELT Antenna Bracket 1 ● G72-23-110 VHF2 Antenna 1 ● HG12-0343 Nut 4 ● HG17-0551 Washer 4 ● HG22-0700 Pin 4 ● HG22-2692 Plug 1 ● HG45-1222 PE Tape 300 mm ● HG73-1153 Grommet 1 ● HG75-3696 ELT Antenna 1 ● HG21-2022 Tyrap 20 ● Local Procure. Carbide Router 1 ● Local Procure. Ø10 mm Drill Bit 1 ● Local Procure. Cyanoacrylate glue AR ● KIT -SB25 -006A SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 3 / 17 Cabri G2 SERVICE BULLETIN Aircraft not equipped with VHF2 Reference Designation Qty Part Cons. Tool. G71-40-220 ELT Coaxial Cable 1 ● G72-03-242 ELT Antenna Bracket 1 ● HG12-0343 Nut 2 ● HG17-0551 Washer 2 ● HG22-0700 Pin 2 ● HG45-1222 PE Tape 300 mm ● HG73-1153 Grommet 1 ● HG75-3696 ELT Antenna 1 ● HG21-2022 Tyrap 20 ● HG40-2813 Fiberglass AR ● HG40-0204 Peel ply AR ● HG32-0188 Epoxy Resin AR ● C3027 Cotton Flock AR ● Local Procure. Methyl Ethyl Ketone AR ● Local Procure. P80 Grit Abrasive AR ● Local Procure. P160 Grit Abrasive AR ● Local Procure. Carbide Router 1 ● Local Procure. Ø10 mm Drill Bit 1 ● Note: The references above shall be ordered under KIT-SB25-006A or -006B. Caution: Composite repair material for aircraft not equipped with VHF2 are not included in the associated kit. Check section 2 of the SB for applicability and order separately, if required. KIT -SB25 -006 B SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 4 / 17 Cabri G2 SERVICE BULLETIN Required Actions 1 Preliminary Steps IPC 7.2-02 a) Remove the ELT from the luggage compartment, b) Switch the ELT OFF, c) Identify the ELT antenna [9] behind the cabin upholstery, pilot side, remove and discard the cable [18]. SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 5 / 17 Cabri G2 SERVICE BULLETIN 2 ELT Antenna Installation Aircraft equipped with VHF2 IPC 7.3-00 a) Remove the engine cowlings following MM 61-B-01, b) Disconnect the connector from the VHF2 antenna [13], c) Remove and discard VHF2 antenna [13], d) Open the tail boom firewall access door and remove both nuts from the upper LH tailboom fitting. Discard the existing VHF2 antenna bracket, e) Install the ELT antenna bracket G72-03-242 with washers HG17-0551, nuts HG12-0343, as shown below: f) Torque nuts to 7.5 - 9 N.m and install cotter pins HG22-0700, g) Install the ELT antenna HG75-3696 on the bracket with its associated washer and nuts, as shown above, Washer HG17-0551 Antenna Bracket G72-03-242 Nut HG12-0343 ELT Antenna HG75-3696 SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 6 / 17 Cabri G2 SERVICE BULLETIN h) Use paper tape to mark the location of the ELT antenna as shown below, i) Remove the ELT antenna and fold back the paper tape as shown below, j) Install the engine cowlings following MM 61-B-02, k) Close the engine cowlings and fold the paper tape back in place as shown below, SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 7 / 17 Cabri G2 SERVICE BULLETIN l) Drill a Ø10 mm hole and enlarge to Ø22 mm using a carbide router, Note: Make sure there is at least a 2 mm gap between the antenna and the composite. m) If necessary, proceed to paint touch-up using paint listed in MM Supplement J70-013, n) Install the ELT antenna on the bracket with its associated washer and nuts, o) Remove both lower nuts and washers from the lower LH and RH tailboom fitting, discard nuts and washers, p) Install antenna bracket G72-03-220 with washers HG17-0551 and nuts HG12-0343 as shown below, q) Torque nuts to 7.5 - 9 N.m and install cotter pins HG22-0700, r) Close the tail boom firewall access door with associated screws, s) Install VHF2 antenna G72-23-110 with its associated washer on the antenna bracket, pointing downward as shown below, t) Connect VHF2 coaxial cable to the antenna as shown below: Washer HG17-0551 + nut HG12-0343 Antenna G72-23-110 Antenna Bracket G72-03-220 SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 8 / 17 Cabri G2 SERVICE BULLETIN u) Identify the interference area between VHF2 antenna and both lateral cowlings as shown below, v) Using a carbide router, trim the cowlings, make sure there is at least a 5 mm gap between the antenna and the composite, w) If necessary, proceed to paint touch-up using paint listed in MM Supplement J70-013, x) Install a plug HG22-2692 in the former VHF2 antenna hole, bond it in place using cyanoacrylate glue.

Show full text

LH cowling RH cowling SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 9 / 17 Cabri G2 SERVICE BULLETIN Aircraft not equipped with VHF2 IPC 6.6-00 a) Open the tail boom firewall access door and remove both nuts from the upper LH tailboom fitting, b) Install the ELT antenna bracket G72-03-242 with washers HG17-0551, nuts HG12-0343, as shown below: c) Torque nuts to 7.5 - 9 N.m and install cotter pins HG22-0700, d) Close the tail boom firewall access door with associated screws, e) Install the ELT antenna HG75-3696 on the bracket with its associated washers and nuts, as shown above, f) Use paper tape to mark the location of the ELT antenna, as shown below: Washer HG17-0551 Antenna Bracket G72-03-242 Nut HG12-0343 ELT Antenna HG75-3696 SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 10 / 17 Cabri G2 SERVICE BULLETIN g) Remove the ELT antenna and fold back the paper tape as shown below: h) Install the engine cowlings following MM 61-B-02, i) Close the engine cowlings fold the paper tape back in place as shown below: j) Check whether the hole to be drilled interferes with existing honeycomb on the inner side. If it does, proceed to honeycomb repair as per section 4, prior to drilling, k) Drill a Ø10 mm hole and enlarge to Ø22 mm using a carbide router, Note: Make sure there is at least a 2 mm gap between the antenna and the composite. l) If necessary, proceed to paint touch-up using paint listed in MM Supplement J70-013, m) Install the ELT antenna on the bracket with its associated washer and nuts. SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 11 / 17 Cabri G2 SERVICE BULLETIN All aircraft 3 ELT Antenna Cable Routing a) Inside the luggage compartment, identify the bottom forward plexiglass cap, b) Gain access to this cap by locally removing the upholstery, Note: This is a delicate task as the upholstery is quite fragile, use care. c) Drill a Ø10 mm hole inside the plexiglass cap identified above, enlarge to Ø22 mm using a carbide router, d) Install grommet HG73-1153 as shown below: Looking inside the luggage compartment Grommet HG73-1153 SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 12 / 17 Cabri G2 SERVICE BULLETIN e) Route the coaxial cable G71-40-220 along the luggage compartment, the engine frame up to the ELT antenna, as depicted below: Note: If AC is installed, remove the aft bulkhead prior proceeding to routing. SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 13 / 17 Cabri G2 SERVICE BULLETIN f) Install PE tape HG45-1222 on the engine frame and maintain ELT coax cable with tyraps HG21-2022, g) Connect the coax cable to the ELT antenna. SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 14 / 17 Cabri G2 SERVICE BULLETIN 4 Engine Cowl Honeycomb Repair a) Mark the ELT antenna hole and the honeycomb to be trimmed as shown below: b) Using a diamond cutting wheel or a carbide router, remove the honeycomb, the edges should then be sharp and free of chips as shown below, c) Degrease the area using MEK and let it dry, do not wipe it with a cloth, SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 15 / 17 Cabri G2 SERVICE BULLETIN d) Mix the resin HG32-0188 with cotton flock C3027 until the desired texture is achieved, then apply a coat on the trimmed honeycomb as shown below: e) Allow to cure at ambient temperature for 12 hours, f) If needed, flatten the surfaces using P80 grit abrasive, g) Prepare 3 plies of fiberglass HG40-2813 as shown below: • 2 plies Z1 and Z2 orientated at 0°/90°, • 1 ply Z3 orientated at ±45°, • 1 peel ply HG40-0204 covering the repaired area. Z3 Z1 Z2 SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 16 / 17 Cabri G2 SERVICE BULLETIN h) Carefully laminate the air bubbles, i) Allow to cure at ambient temperature for 12 hours then 60°C for 4 to 6 hours, j) Sand the area using P160 grit abrasive, prior to finishing, k) Proceed to a paint touch-up on the affected zone using paint listed in MM Supplement J70-013. SB 25-006 B The technical content of this document is approved under the authority of the DOA ref. EASA.21J.211 17 / 17 Cabri G2 SERVICE BULLETIN 5 Flight Manual Temporary Revision a) If applicable, remove the Flight Manual Temporary Revision J40-001-TR1 from the flight manual. 6 Final Steps a) Reinstall the ELT inside the luggage compartment, switch the ELT to ARMED, b) Turn Master and VHF2 ON, check radio transmission and reception, if applicable, c) Perform an ELT test following MM 72-C-02.

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