Airworthiness Directive · Amendment 39-14283 · Short Brothers Model SD3 Airplanes
Short Brothers Model SD3 Airplanes
This AD applies to all Shorts Model SD3-60 SHERPA, SD3-SHERPA, SD3-30, and SD3-60 airplanes, certificated in any category.
The FAA is superseding an existing airworthiness directive (AD), which applies to all Short Brothers Model SD3-30 and SD3-60 airplanes equipped with certain fire extinguishers. That AD currently requires replacement of the covers for fire extinguisher adapter assemblies that are installed on certain bulkheads with new covers that swivel to lock the extinguishers in place; and replacement of nozzles and triggers on these fire extinguishers with better fitting nozzles and stronger triggers. The existing AD also currently requires the installation of new fire extinguisher point placards and a revision of the airplane flight manual (AFM) to instruct the flightcrew in the use of the new covers for these adapter assemblies. This new AD also requires modification of the fire extinguishing point adapter assembly of the forward and aft baggage bays as applicable. This new AD also adds airplanes to the applicability. For these new airplanes, this new AD requires a revision to the AFM for instructions on using the new fire extinguisher adapter. This AD results from reports of individuals experiencing fire extinguishant blowback when the extinguishant discharges through the fire extinguishing point adapters. We are issuing this AD to prevent fire extinguishant blowback, which could result in injury to a person using the fire extinguisher in the event of a fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
For Model SD3-30 and SD3-60 airplanes equipped with Fire Fighting Enterprises (U.K.) Ltd. fire extinguishers: Within 6 months after June 8, 1998 (the effective date of AD 98-09-28), install a new cover on each fire extinguisher adapter assembly on bulkheads between the passenger cabin and aft and/or forward baggage bay, in accordance with Shorts Service Bulletin SD330-26-14, dated September 1994 (for Shorts Model SD3-30 airplanes), or Shorts Service Bulletin SD360-26-11, dated July 1994 (for Shorts Model SD3-60 airplanes), as applicable.
For Model SD3-30 and SD3-60 airplanes equipped with Fire Fighting Enterprises (U.K.) Ltd. fire extinguishers: Prior to further flight after accomplishing the actions required by paragraph (f) of this AD, accomplish both paragraphs (g)(1) and (g)(2) of this AD:
(1) Install new fire extinguisher point placards, in accordance with Shorts Service Bulletin SD330-26-14, dated September 1994 (for Shorts Model SD3-30 airplanes), or Shorts Service Bulletin SD360-26-11, dated July 1994 (for Shorts Model SD3-60 airplanes), as applicable. And
(2) Revise the Limitations section of the FAA-approved AFM, in accordance with Note 1 of Paragraph 1.C. of Shorts Service Bulletin SD330-26-14, dated September 1994 (for Shorts Model SD3-30 airplanes), or Shorts Service Bulletin SD360-26-11, dated July 1994 (for Shorts Model SD3-60 airplanes), as applicable.
For Model SD3-30 and SD3-60 airplanes equipped with fire extinguishers having part number (P/N) BA51012SR-3 or BA51012SR: Within 6 months after June 8, 1998, accomplish either paragraph (h)(1) or (h)(2) of this AD:
(1) Install a chamfered nozzle on the discharge head assembly of each fire extinguisher and add a new trigger by replacing the discharge head assembly with a new discharge head assembly having P/N BA22988-3, in accordance with Fire Fighting Enterprises (U.K.) Ltd. Service Bulletin 26-107, Revision 1, dated November 2, 1992.
Or
(2) Replace the trigger on the discharge head assembly of each fire extinguisher with a new trigger, in accordance with Fire Fighting Enterprises (U.K.) Ltd. Service Bulletin 26-108, dated September 1992. After replacement, install a chamfered nozzle on the discharge head assembly of each fire extinguisher by reworking the discharge head assembly in accordance with Fire Fighting Enterprises (U.K.) Ltd. Service Bulletin 26-107, Revision 1, dated November 2, 1992.
(i) For Model SD3 airplanes equipped with Fire Fighting Enterprises (U.K.) Ltd. fire extinguishers: Within 3 months after the effective date of this AD, modify the fire extinguishing point adapter assembly of the forward and aft baggage bays, as applicable, by doing all of the actions specified in the Accomplishment Instructions of Shorts Service Bulletin SD330-26-15, dated May 29, 2002 (for Model SD3-30 airplanes); Shorts Service Bulletin SD360-26-13, dated May 29, 2002 (for Model SD3-60 airplanes); Shorts Service Bulletin SD360 Sherpa-26-1, dated May 29, 2002 (for Model SD3-60 SHERPA airplanes); or Shorts Service Bulletin SD3 Sherpa-26-3, dated May 29, 2002 (for Model SD3-SHERPA airplanes); as applicable.
For Model SD3-60 SHERPA and SD3-SHERPA airplanes equipped with Fire Fighting Enterprises (U.K.) Ltd. fire extinguishers: Before further flight after accomplishing the modification required by paragraph (i) of this AD, revise the Limitations section of the Short Brothers SD3-60 SHERPA AFM, Document No. SB.6.2, by inserting into the AFM Short Brothers Document No. SB.6.2, Amendment P/5, dated February 6, 2002 (for Model SD3-60 SHERPA airplanes); or of the Short Brothers SD3-SHERPA AFM, Document No. SB.5.2, by inserting into the AFM Short Brothers Document No. SB.5.2, Amendment P/7, dated February 6, 2002 (for Model SD3-SHERPA airplanes); as applicable.
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.
