Spring Operations Alert: CL 605 Takeoff Safety Enhancement (TOSE) Service Bulletin

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West Star Aviation urges Challenger 605 operators to prioritize scheduling TOSE wing anti-icing inspections ahead of peak season to ensure kit availability amid spring's variable conditions.

April 3, 2026

As spring weather brings a mix of rain, temperature swings, and changing conditions across North America, West Star Aviation reminds Challenger 605 operators of the importance of Service Bulletin (SB) 605-30-003 Revision 2 — Ice and Rain Protection: Take Off Safety Enhancement (TOSE), Supplemental Ground Wing Anti-Icing, Divided Parts Installation.

While this service bulletin is currently classified as recommended, it is already mandated by Canadian and EASA Airworthiness Directive CF-2017-007R1. Given the operational safety implications and international regulatory alignment, it is possible that the FAA could issue an Airworthiness Directive (AD) in the coming months incorporating this bulletin.

Applicability

SB 605-30-003 Rev 2 applies to:

CL 605 aircraft serial numbers 5701 through 5990
Aircraft Pre-SB 605-30-001

Prerequisite Requirement

SB 605-34-028 (Relocation of the Lift Dump System – LDS) must be completed prior to or at the same time as incorporation of this service bulletin.

Safety Background

Paragraph B of the service bulletin outlines the safety concern:

“A stall immediately after the take-off can occur during winter operations, because of ice contamination on the wing, when the anti-ice procedures are not obeyed.”

Ice or frost contamination on the wing’s leading edge during ground operations presents a significant safety risk. The Take Off Safety Enhancement (TOSE) system is specifically designed to mitigate this hazard.

What the TOSE System Provides

The TOSE system enhances ground anti-icing capability by:

Removing and preventing ice and frost accumulation on wing leading edges prior to takeoff
Maintaining leading-edge temperature above freezing while staying below the maximum allowable temperature for anti-icing fluid application
Incorporating low heat and overheat monitoring functions to ensure system performance and safety

The system ensures proper thermal control during ground operations to reduce the risk of contamination-related aerodynamic degradation during takeoff.

Downtime Planning and Scheduling Considerations

Although this bulletin is recommended, operators were originally given five years from its September 21, 2017, issuance to incorporate it. Many operators not governed by Canadian or EASA authority may have deferred compliance.

However, proactive planning is strongly encouraged.

Strategic Scheduling Recommendation

West Star recommends incorporating SB 605-30-003 Rev 2 in conjunction with:

48-Month Repeat Inspection
96-Month Inspection

By aligning the service bulletin with these scheduled inspections, operators can:

Utilize existing interior and panel access
Reduce redundant labor
Minimize aircraft downtime
Lower overall incorporation costs

If completed outside of a 48-, 96-, or 192-month inspection, operators should expect additional interior access labor.

Man-hours and Labor Impact

Estimated labor: 405 man hours
Man-hour estimate does not include required interior access
Additional interior access can exceed 75 man hours if not combined with major inspections
If performed outside of a 48-, 96-, or 192-month inspection, operators can expect approximately $15,000 in additional labor costs

Bombardier currently manages this bulletin under a dedicated campaign, requiring a minimum six weeks lead time for planning.

Required Parts and Materials

The following kits are required:

650-K30-001A
650-K30-001B
650-K30-001C

At this time, kit lead times are not consistently provided once ordered, making early coordination critical for effective downtime management.

Why Address This Now?

With winter operations underway and regulatory scrutiny increasing worldwide, this service bulletin addresses a documented takeoff safety concern. While not yet mandated by the FAA, international adoption and safety implications suggest operators should plan proactively rather than reactively.

Completing the bulletin during a scheduled 48- or 96-month inspection:

Reduces incremental downtime
Mitigates additional interior access costs
Allows efficient use of inspection access points
Minimizes overall financial impact

SB 605-30-003 Rev 2 is a recommended bulletin with significant winter operational safety implications for CL 605 aircraft. Although some operators have postponed compliance, incorporation alongside scheduled major inspections provides measurable savings in downtime and labor.

West Star Aviation encourages operators to evaluate their inspection timelines now and coordinate early to ensure kit availability and proper scheduling — especially during peak winter operating seasons.

For planning assistance or to discuss scheduling options, please contact any of the

West Star Aviation specialists below: