# SAIB SW-07-29: High skid gear crosstubes

- Type: Special airworthiness information bulletin (advisory, not mandatory)
- Status: Current
- Revision: 0
- Issued: April 18, 2007
- Products: Agusta AB412, AB412 EP, 412, 412CF and 412EP
- Product type: Aircraft, Rotorcraft
- PDF: https://openairdocs.org/files/sha256/5e/9a/5e9a4858f615b1baba06f99e8252e32eccf0a49ee8c6e0d7f939b71f5b464f62
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/73302FB21F3A720D862572C1005436A3.0001
- DRS record last changed: April 18, 2007
- Page: https://openairdocs.org/saib/SW-07-29

## Text

FAA Aircraft Certification Service

**SPECIAL AIRWORTHINESS**

INFORMATION BULLETIN http://www.faa.gov/aircraft/safety/alerts/SAIB

SAIB: SW-07-29 Date: April 18, 2007 This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin (SAIB) alerts owners and operators of Bell Helicopter Textron, Inc. and Agusta S.p.A. Model helicopters (listed in table 1) with Aeronautical Accessories, Inc. (AAI) part number 412-321 series high skid gear crosstubes (crosstubes) installed in accordance with AAI’s STC No. SR01052AT, that the crosstubes may develop cracks and fail prior to reaching the FAA approved life limit. AAI has issued an Operations Safety Notice (OSN) which state operators should perform inspections as soon as possible of both the forward and aft crosstubes. This OSN is available on the company web site at www.edwards-assoc.com. The OSN is listed under Technical Bulletins as AA-07024NR and dated March 27, 2007.

Table 1 Manufacturer Model Bell Helicopter Textron, Inc 412, 412EP, and 412CF Agusta S.p.A. AB412 and AB412EP

Background

Three reports from the field of failed aft crosstubes have been reported to AAI. Two of those failures occurred during landing. The other failure occurred during transport of the aircraft on ground handling platform equipment. Also, in one case during landing, the aft crosstube failed and subsequently the front cross tube failed causing the helicopter to lean severely on the failed right side.

Recommendations

As soon as possible, perform a maintenance inspection of the forward and aft cross tubes in accordance with AAI, Instructions for Continued Airworthiness (ICA), for crosstubes, Report No. AA-01136, Revision “C,” dated July 30, 2002, Section 3.0. If any crack or any damage outside the limits specified in the ICA is found, replace with airworthy parts before further flight.

For Further Information, Contact

Marc Belhumeur, Aerospace Engineer, Rotorcraft Certification Office, ASW-170, 2601 Meacham Blvd., Fort Worth, Texas 76193; phone: (817)222-5177; fax: (817) 222-5783; email:

mark.belhumeur@faa.gov.

## Registered aircraft it may concern (OpenAirDocs)

Registry models matched by make and model, the same way as ADs, most registered aircraft first.

- [Bell Textron Canada 412EP](https://openairdocs.org/model/bell-textron-canada-412ep): 33 registered aircraft (airframe model)
- [Bell 412EP](https://openairdocs.org/model/bell-412ep): 26 registered aircraft (airframe model)
- [Bell Helicopter Textron Canada 412EP](https://openairdocs.org/model/bell-helicopter-textron-canada-412ep): 17 registered aircraft (airframe model)
- [Bell 412](https://openairdocs.org/model/bell-412): 11 registered aircraft (airframe model)
- [Bell 412 CF](https://openairdocs.org/model/bell-412-cf): 0 registered aircraft (airframe model)
- [Bell 412 RSAF](https://openairdocs.org/model/bell-412-rsaf): 0 registered aircraft (airframe model)
- [Bell Helicopter Textron Canada 412](https://openairdocs.org/model/bell-helicopter-textron-canada-412): 0 registered aircraft (airframe model)

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