Airworthiness Directives; Jetstream Model ATP Airplanes

[Federal Register Volume 60, Number 156 (Monday, August 14, 1995)]
[Rules and Regulations]
[Pages 41793-41795]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-19231]



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Rules and Regulations
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Federal Register / Vol. 60, No. 156 / Monday, August 14, 1995 / Rules 
and Regulations


[[Page 41793]]


DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 94-NM-151-AD; Amendment 39-9333; AD 95-17-04]


Airworthiness Directives; Jetstream Model ATP Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: This amendment supersedes an existing airworthiness directive 
(AD), applicable to all Jetstream Model ATP airplanes, that currently 
requires revising the Airplane Flight Manual (AFM) to prohibit flight 
in freezing precipitation conditions. This amendment adds a requirement 
to install modifications of the engine air intake system. This 
amendment is prompted by the development of modifications of the engine 
air intake system intended to permit operation of these airplanes in 
freezing precipitation conditions. The actions specified by this AD are 
intended to prevent engine power rollback in flight during freezing 
precipitation conditions.

DATES: Effective September 13, 1995.
    The incorporation by reference of certain publications, as listed 
in the regulations, is approved by the Director of the Federal Register 
as of September 13, 1995.
    The incorporation by reference of certain other publications listed 
in the regulations was approved previously by the Director of the 
Federal Register as of June 15, 1994 (59 FR 25290, May 16, 1994).

ADDRESSES: The service information referenced in this AD may be 
obtained from Jetstream Aircraft, Inc., P.O. Box 16029, Dulles 
International Airport, Washington, DC 20041-6029. This information may 
be examined at the Federal Aviation Administration (FAA), Transport 
Airplane Directorate, Rules Docket, 1601 Lind Avenue SW., Renton, 
Washington; or at the Office of the Federal Register, 800 North Capitol 
Street NW., suite 700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: William Schroeder, Aerospace Engineer, 
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate, 
1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (206) 
227-2148; fax (206) 227-1320.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) by superseding AD 94-08-01, 
amendment 39-8872 (59 FR 25290, May 16, 1994), which is applicable to 
all Jetstream Model ATP airplanes, was published in the Federal 
Register on December 29, 1994 (59 FR 67243). The action proposed to 
require certain actions that were previously optional terminating 
actions. The action also proposed to provide several new optional 
terminating actions. Additionally, the action proposed to revise the 
applicability of the rule. -
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the single comment received. -
    The commenter supports the proposed rule.
    After careful review of the available data, including the comment 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule as proposed.
    The FAA estimates that 10 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 150 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $60 per work hour. Required parts will be provided by the 
manufacturer at no cost to the operator. Based on these figures, the 
total cost impact of the AD on U.S. operators is estimated to be 
$90,000, or $9,000 per airplane.
    The total cost impact figure discussed above is based on 
assumptions that no operator has yet accomplished any of the 
requirements of this AD action, and that no operator would accomplish 
those actions in the future if this AD were not adopted.
    The regulations adopted herein will not have substantial direct 
effects on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Therefore, in 
accordance with Executive Order 12612, it is determined that this final 
rule does not have sufficient federalism implications to warrant the 
preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this action (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a 
significant economic impact, positive or negative, on a substantial 
number of small entities under the criteria of the Regulatory 
Flexibility Act. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it may be obtained 
from the Rules Docket at the location provided under the caption 
ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. App. 1354(a), 1421 and 1423; 49 U.S.C. 
106(g); and 14 CFR 11.89.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by removing amendment 39-8872 (59 FR 
25290, May 16, 1994), and by adding a new airworthiness directive (AD), 
amendment 39-9333, to read as follows:

95-17-04  Jetstream Aircraft Limited (Formerly British Aerospace 
Commercial Aircraft Limited): Amendment 39-9333. Docket 94-NM-151-
AD. Supersedes AD 94-08-01, Amendment 39-8872.

    Applicability: Model ATP airplanes, as listed in Jetstream 
Service Bulletin ATP 54-

[[Page 41794]]
13-35274B, Revision 2, dated August 18, 1994, certificated in any 
category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
modified, altered, or repaired in the area subject to the 
requirements of this AD. For airplanes that have been modified, 
altered, or repaired so that the performance of the requirements of 
this AD is affected, the owner/operator must use the authority 
provided in paragraph (e) to request approval from the FAA. This 
approval may address either no action, if the current configuration 
eliminates the unsafe condition; or different actions necessary to 
address the unsafe condition described in this AD. Such a request 
should include an assessment of the effect of the changed 
configuration on the unsafe condition addressed by this AD. In no 
case does the presence of any modification, alteration, or repair 
remove any airplane from the applicability of this AD.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent loss of multiple engine power during flight in 
freezing precipitation, accomplish the following:
    (a) Within 30 days after June 15, 1994 (the effective date of AD 
94-08-01, amendment 39-8872), revise the Limitations Section of the 
FAA-approved Airplane Flight Manual (AFM) to include the following 
statement. This may be accomplished by inserting a copy of this AD 
in the AFM.
    ``Flight is prohibited into forecast or reported freezing 
precipitation conditions where the outside air temperature is 
between +5 deg.C and -5 deg.C.''
    (b) Within 72 days after the effective date of this AD, 
accomplish the actions specified in paragraphs (b)(1), (b)(2), 
(b)(3), (b)(4), (b)(5), and (b)(6), which will constitute 
terminating action for the AFM revision required by paragraph (a) of 
this AD. Once these actions are completed, the AFM revision required 
by paragraph (a) may be removed.
    (1) Revise the Limitations Section and the Normal Procedures 
Section of the FAA-approved AFM, to include the information 
specified in Temporary Revision T/33, Issue 1, dated November 1, 
1993, and Temporary Revision T/38, Issue 1, dated February 16, 1994, 
which introduce procedures for operation in icing conditions, as 
specified in the temporary revision; and operate the airplane in 
accordance with those limitations and procedures.

    Note 2: This may be accomplished by inserting copies of 
Temporary Revision T/33 and T/38 in the AFM. When these temporary 
revisions have been incorporated into general revisions of the AFM, 
the general revisions may be inserted in the AFM, provided the 
information contained in the general revision is identical to that 
specified in Temporary Revision T/33 and T/38.

    (2) Incorporate a revision into the FAA-approved maintenance 
program that provides for replacement of engine igniter plugs at the 
intervals specified in Jetstream Service Bulletin ATP-80-06, 
Revision 1, dated October 22, 1993, or Revision 2, dated October 16, 
1994. Initial replacement of an engine igniter plug with a new plug 
shall be accomplished prior to the accumulation of 200 total hours 
time-in-service on the engine igniter plug, or within 50 hours time-
in-service after incorporating the maintenance program revision, 
whichever occurs later.
    (3) Install an eductor plate over the exhaust port of the engine 
air intake system in accordance with Jetstream Service Bulletin ATP-
54-12-35274A, dated September 28, 1993, or Revision 1, dated 
December 15, 1993. Any eductor plate installed in accordance with 
the original issue of the service bulletin must be inspected for any 
aperture profile mismatch, in accordance with paragraph 2., Part B., 
of the Accomplishment Instructions of Revision 1 of the service 
bulletin. If any mismatch is found that exceeds the limit specified 
in that service bulletin, prior to further flight, correct the 
discrepancy in accordance with paragraph 2., Part C, of Revision 1 
of the service bulletin.
    (4) For airplanes having constructor's numbers 2007, 2010 
through 2016 inclusive, 2020 through 2022 inclusive, 2028, 2029, 
2032, 2034 through 2037 inclusive, 2041 through 2044 inclusive, 
2051, 2053, and 2056: Install engine air inlet ducts that 
incorporate electrical de-ice heaters with increased power and area, 
and perform associated electrical system changes, in accordance with 
the Accomplishment Instructions, in Jetstream Service Bulletin ATP-
54-13-35274B, dated October 9, 1993, or Parts A through F of 
Revision 1, dated July 8, 1994, or Revision 2, dated August 18, 
1994.
    (5) For airplanes having constructor's numbers 2002 through 2006 
inclusive, 2008, 2009, 2017 through 2019 inclusive, 2023 through 
2027 inclusive, 2030, 2031, 2033, 2038 through 2040 inclusive, 2045 
through 2050 inclusive, 2052, 2054 through 2055 inclusive, and 2057 
through 2063 inclusive: Install engine air inlet ducts that 
incorporate electrical de-ice heaters with increased power, in 
accordance with the Accomplishment Instructions, Part G, of 
Jetstream Service Bulletin ATP-54-13-35274B, Revision 2, dated 
August 18, 1994.

    Note 3: Installation of engine air inlet ducts in accordance 
with Jetstream Service Bulletin ATP-54-15-35274E, dated July 27, 
1994, is considered acceptable for compliance with either paragraph 
(b)(4) or (b)(5) of this AD.

    (6) Revise the FAA-approved maintenance program to include 
repetitive visual inspections for damage of the heater mats at 
intervals not to exceed 50 hours time-in-service, in accordance with 
Jetstream Service Bulletin ATP-54-14, dated October 14, 1993; and, 
if any damage is found, prior to further flight, replace the engine 
air intake in accordance with the service bulletin.
    (c) The following installations on both engines constitute 
terminating action for the repetitive replacement of the engine 
igniter plugs required by paragraph (b)(2) of this AD:
    (1) Installation of new de-ice timers in accordance with 
Jetstream Service Bulletin ATP-30-39-30146A, dated July 29, 1994,
    (2) Wiring changes to incorporate automatic duct heat when 
engine air intake lip heat is selected ``on,'' in accordance with 
Jetstream Service Bulletin ATP-30-37-30143A, dated August 1, 1994, 
or Revision 1, dated September 5, 1994, and
    (3) Installation of an engine automatic ignition system in 
accordance with Jetstream Service Bulletin ATP-80-7-30141A, Revision 
2, dated November 4, 1994; and an associated revision of the FAA-
approved Airplane Flight Manual (AFM) by incorporating the 
information contained in Temporary Revision T/42, Issue 1, dated 
August 12, 1994.
    (d) For airplanes on which the engine air intake (Modification 
35274E) has been installed in accordance with Jetstream Service 
Bulletin ATP-54-15-35274E, dated July 27, 1994: The installation of 
engine duct de-ice overheat protection (Modification 35274D) in 
accordance with Jetstream Service Bulletin ATP-30-44-35274D, dated 
August 12, 1994, constitutes terminating action for the repetitive 
inspections required by paragraph (b)(6) of this AD.
    (e) An alternative method of compliance or adjustment of the 
compliance time that provides an acceptable level of safety may be 
used if approved by the Manager, Standardization Branch, FAA, 
Transport Airplane Directorate, ANM-113. Operators shall submit 
their requests through an appropriate FAA Principal Maintenance 
Inspector, who may add comments and then send it to the Manager, 
Standardization Branch.

    Note 4: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Standardization Branch, ANM-113.

    (f) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the airplane to a location where 
the requirements of this AD can be accomplished.
    (g) The actions shall be done in accordance with the following 
documents, as applicable, which contain the specified effective 
pages:

----------------------------------------------------------------------------------------------------------------
 Service bulletin referenced and                                     Revision level                             
              date                            Page No.                shown on page       Date shown on page    
----------------------------------------------------------------------------------------------------------------
Temporary Revision T/42.........  1-18............................  1...............  August 12, 1994.          
Issue 1, August 12, 1994........  3-7.............................  Original........  March 2, 1993.            
ATP 30-37-30143A, August 1, 1994  1-15............................  Original........  August 1, 1994.           

[[Page 41795]]
                                                                                                                
ATP 30-37-30143A, Revision 1,     1-3, 5-10, 14-17................  1-..............  September 5, 1994.-       
 September 5, 1994.                                                                                             
                                  4, 11-13........................  Original........  August 1, 1994.           
ATP-30-39-30146A, July 29, 1994.  1-7.............................  Original........  July 29, 1994.            
ATP-30-44-35274D, August 12,      1-56............................  Original........  August 12, 1994.          
 1994.                                                                                                          
ATP-54-13-35274B, Revision 1,     1-45............................  1...............  July 8, 1994.             
 July 8, 1994.                                                                                                  
ATP-54-13-35274B, Revision 2,     1-4, 9, 10-.....................  2...............  August 18, 1994.          
 August 18, 1994.                                                                                               
                                  5-8, 11-45......................  1-..............  July 8, 1994.             
ATP-80-06, Revision 2, October    1-6.............................  2...............  October 16, 1994.         
 16, 1994.                                                                                                      
ATP-80-7-30141A, Revision 2,      1, 3, 5-8, 11, 14, 17, 18, 20-    2...............  November 4, 1994.         
 November 4, 1994.                 28, 36, 38, 45, 46, 51-55.                                                   
                                  2, 4, 9, 10, 12, 13, 15, 16, 19,  Original........  August 1, 1994.           
                                   29-35, 37, 39-44, 47-50.                                                     
----------------------------------------------------------------------------------------------------------------


    This incorporation by reference of certain publications listed in 
the regulations was approved by the Director of the Federal Register in 
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. The incorporation by 
reference of certain other publications listed in the regulations was 
approved previously by the Director of the Federal Register in 
accordance with 5 U.S.C. 552(a) and 1 CFR part 51 as of June 15, 1994 
(59 FR 29290, May 16, 1994). Copies may be obtained from Jetstream 
Aircraft, Inc., P.O. Box 16029, Dulles International Airport, 
Washington, DC 20041-6029. Copies may be inspected at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington; or at the Office of the Federal Register, 800 North Capitol 
Street, NW., suite 700, Washington, DC.
    (h) This amendment becomes effective on September 13, 1995.

    Issued in Renton, Washington, on July 31, 1995.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 95-19231 Filed 8-11-95; 8:45 am]
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