Airworthiness Directive · Amendment 39-16479 · Fire protection
Learjet Inc. Model 45 Airplanes
This AD applies to Learjet Inc. Model 45 airplanes, certificated in any category; as identified in Bombardier Service Bulletins 40-26-05 and 45-26-9, both Revision 2, both dated May 4, 2009.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires replacing aluminum fire extinguisher discharge tubes with new, improved tubes; checking the fire extinguisher container for certain serial numbers; replacing fire extinguisher containers that have affected serial numbers; inspecting the pressure indicator on certain fire extinguisher containers for discrepancies; and performing corrective action if necessary. This AD was prompted by a report of accidental discharge of a fire extinguisher container and damage to an aluminum discharge tube. Investigation revealed that following the discharge an inaccurate pressure indication, due to the indicator dial being incorrectly staked, showed that the container was fully charged. We are issuing this AD to prevent inaccurate pressure readings and subsequent damage to the discharge tubes during operation, which could result in failure of the fire extinguisher system and an uncontained fire in an emergency situation.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 12 months after the effective date of this AD: Replace the aluminum fire extinguisher discharge tubes with new, improved stainless steel tubes; check the fire extinguisher container for any serial number specified in Table 1 of Bombardier Service Bulletin 40-26-05 or 45-26-9, both Revision 2, both dated May 4, 2009, as applicable; replace any containers that have affected serial numbers, do a weight check of all containers, including the replacement container, if applicable; and inspect the pressure indicator on the containers for discrepancies; by doing all applicable actions in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 40-26-05 or 45-26-9, both Revision 2, both dated May 4, 2009; as applicable. If any discrepancy is found, replace the container before further flight in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 40-26-05 or 45-26-9, both Revision 2, both dated May 4, 2009; as applicable.
(h) Actions done before the effective date of this AD in accordance with the applicable service information listed in Table 1 of this AD are acceptable for compliance with the corresponding requirements in paragraph (g) of this AD.
| Affected Serial Numbers— | Bombardier Service Bulletin— | Revision— | Dated— |
|---|---|---|---|
| For Model 45 airplanes having serial numbers 2001 through 2114, inclusive | 40-26-05 | Basic Issue | November 24, 2008. |
| For Model 45 airplanes having serial numbers 2001 through 2114, inclusive | 40-26-05 | 1 | December 22, 2008. |
| For Model 45 airplanes having serial numbers 006 through 383, inclusive | 45-26-9 | Basic Issue | November 24, 2008. |
| For Model 45 airplanes having serial numbers 006 through 383, inclusive | 45-26-9 | 1 | December 22, 2008. |
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
