[Federal Register Volume 66, Number 126 (Friday, June 29, 2001)]
[Rules and Regulations]
[Pages 34532-34533]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-16203]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2001-NM-83-AD; Amendment 39-12191; AD 2001-08-13]
RIN 2120-AA64


Airworthiness Directives; Gulfstream Model G-1159, G-1159A, G-
1159B, G-IV, and G-V Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule; correction.

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

SUMMARY: This amendment corrects and clarifies information in an 
existing airworthiness directive (AD), applicable to certain Gulfstream 
Model G-1159, G-1159A, G-1159B, G-IV, and G-V series airplanes, that 
currently requires an inspection to determine if certain door control 
valves of the landing gear are installed, and modification of the 
valve, if necessary. The actions specified in that AD are intended to 
prevent loss of hydraulic system fluid due to failure of the door 
control valve of the landing gear, which could require the flight crew 
to use alternate gear extension procedures (landing gear blow down) for 
landing of all models. This amendment corrects the requirements of the 
current AD by specifying appropriate alert customer bulletins for 
certain airplane models, and clarifying the compliance time for the 
modification of the door control valve of the landing gear. This 
amendment is prompted by operators' comments on the existing AD.

DATES: Effective May 10, 2001.
    The incorporation by reference of certain publications listed in 
the regulations was approved previously by the Director of the Federal 
Register as of May 10, 2001 (66 FR 20734, April 25, 2001).

FOR FURTHER INFORMATION CONTACT: Frank Mokry, Aerospace Engineer, 
Systems and Flight Test Branch, ACE-116A, FAA, Atlanta Aircraft 
Certification Office, One Crown Center, 1895 Phoenix Boulevard, suite 
450, Atlanta, Georgia 30349; telephone (770) 703-6066; fax (770) 703-
6097.

SUPPLEMENTARY INFORMATION: On April 16, 2001, the Federal Aviation 
Administration (FAA) issued Airworthiness Directive (AD) 2001-08-13, 
amendment 39-12191 (66 FR 20734, April 25, 2001), which applies to 
certain Gulfstream Model G-1159, G-1159A, G-1159B, G-IV, and G-V series 
airplanes. That AD requires inspection and modification of certain door 
control valves of the nose landing gear and the main landing gear. The 
actions required by that AD are intended to prevent loss of hydraulic 
system fluid due to failure of the door control valve of the landing 
gear, which could require the flight crew to use alternate gear 
extension procedures (landing gear blow down) for landing of all 
models.

Need for the Correction and Clarification

    Since the issuance of that AD, the FAA has received information 
that requires certain corrections and clarifications for that AD.
    In indicating which Gulfstream alert customer bulletin to use in 
accomplishing the required actions for each of the five Gulfstream 
airplane models affected, the FAA inadvertently reversed the bulletins 
indicated for the G-1159, G-1159B, and G-1159A Gulfstream models. That 
information also was included in the applicability section in the table 
entitled ``Gulfstream Airplane Models and Alert Customer Bulletins 
(ACB)'' and in paragraph (b) of AD 2001-08-13. This document corrects 
the references to the appropriate alert customer bulletins, and will 
ensure that the appropriate Gulfstream bulletin is used to accomplish 
the actions required by this AD for each of the five Gulfstream models 
to which it applies.
    Additionally, this document also corrects and clarifies the 
compliance time specified for the actions specified in paragraph (b) of 
the AD. The FAA inadvertently specified the compliance times for 
paragraphs (b)(1) and (b)(2) of the AD as ``* * * after the effective 
date of this AD.'' We intended that the requirements of paragraph (b) 
of that AD should read ``* * * after the date of inspection 
accomplished per the requirements of paragraph (a) of this AD.'' 
Correction of that wording permits a somewhat extended compliance time 
for the operators to accomplish the requirements of paragraph (b) of 
this AD. Therefore, this correction is a relieving requirement for 
operators and necessitates no additional work or cost burdens.

Correction of the Publication

    This document corrects an error, clarifies certain requirements, 
and correctly adds the AD as an amendment to section 39.13 of the 
Federal Aviation Regulations (14 CFR 39.13).
    The AD is being reprinted in its entirety for the convenience of 
affected operators. The effective date of the AD remains May 10, 2001.
    Since this action only clarifies a current requirement, it has no 
adverse economic impact and imposes no additional burden on any person. 
Therefore, notice and public procedures hereon are unnecessary.

List of Subjects in 14 CFR Part 39

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

Adoption of the Correction

    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. 106(g), 40113, 44701.


Sec. 39.13  [Corrected]

    2. Section 39.13 is amended by correctly adding a new airworthiness 
directive, to read as follows:

2001-08-13   Gulfstream Aerospace Corporation: Amendment 39-12191. 
Docket 2001-NM-83-AD.

    Applicability: Model G-1159, G-1159A, G-1159B, G-IV, and G-V 
series airplanes, as specified in the Gulfstream Alert Customer 
Bulletins listed in the following table; certificated in any 
category:

[[Page 34533]]



                     Table 1--Gulfstream Airplane Models and Alert Customer Bulletins (ACB)
----------------------------------------------------------------------------------------------------------------
                 Model                                  ACB                                 Dated
----------------------------------------------------------------------------------------------------------------
G-1159 and G-1159B (G-II/IIB) series    No. 27.............................  March 20, 2001.
 airplanes.
G-1159A (G-III) series airplanes......  No. 13.............................  March 20, 2001.
G-IV series airplanes.................  No. 27.............................  March 20, 2001.
G-V series airplanes..................  No. 12.............................  March 20, 2001.
----------------------------------------------------------------------------------------------------------------


    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 request approval for an 
alternative method of compliance in accordance with paragraph (d) of 
this AD. The request should include an assessment of the effect of 
the modification, alteration, or repair on the unsafe condition 
addressed by this AD; and, if the unsafe condition has not been 
eliminated, the request should include specific proposed actions to 
address it.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent loss of hydraulic system fluid due to failure of the 
door control valve of the landing gear, which could require the 
flight crew to use alternate gear extension procedures (landing gear 
blow down) for landing of all models; accomplish the following:

Inspection and Replacement of Valves

    (a) Within 15 landings or 30 days after the effective date of 
this AD, whichever occurs later: Perform a general visual inspection 
to determine if any landing gear door control valve having 
Gulfstream part number (P/N) 1159SCH231-33 with Eaton/Sterer P/N 
65940-1, -1 Rev. A, or -1 Rev. B, is installed.

    Note 2: For the purposes of this AD, a general visual inspection 
is defined as: ``A visual examination of an interior or exterior 
area, installation, or assembly to detect obvious damage, failure, 
or irregularity. This level of inspection is made under normally 
available lighting conditions such as daylight, hangar lighting, 
flashlight, or drop-light, and may require removal or opening of 
access panels or doors. Stands, ladders, or platforms may be 
required to gain proximity to the area being checked.''

    (1) If no valve has those P/N's, no further action is required 
by this paragraph.
    (2) If all valves found have P/N 1159SCH231-33 with Eaton/Sterer 
P/N 65940-1, Rev. C, no further action is required by this 
paragraph.
    (b) If any valve has a door control valve of the landing gear 
having Gulfstream P/N 1159SCH231-33 with Eaton/Sterer P/N 65940-1 
and a serial number as specified in paragraph (b)(1) or (b)(2) of 
this AD: Replace the set screw with a new set screw, fill with Dow 
Corning RTV 732 sealant, and label the valve as P/N 65940-1 Rev. C; 
in accordance with Gulfstream G-II ACB No. 27 (for Model G-1159 and 
G-1159B series airplanes), G-III ACB No. 13 (for Model G-1159A 
series airplanes), G-IV ACB No. 27 (for Model G-IV series 
airplanes), and G-V ACB No. 12 (for Model G-V series airplanes); all 
dated March 20, 2001, as applicable; at the times specified in 
paragraph (b)(1) or (b)(2), as applicable.
    (1) For valves having serial number 1900 or higher: Within 5 
landings or 15 days after the inspection accomplished per the 
requirements of paragraph (a) of this AD, whichever occurs later.
    (2) For valves having a serial number less than 1900: Within 50 
landings or 90 days after the inspection accomplished per the 
requirements of paragraph (a) of this AD, whichever occurs later.

    Note 3: The Gulfstream ACB's specified in paragraphs (a) and (b) 
of this AD reference Eaton Aerospace Sterer Engineering Service 
Bulletin 65940-27-01, dated March 1, 2001, as an additional source 
of service information.

    (c) As of the effective date of this AD, no person shall install 
on any airplane a door control valve of the landing gear, Gulfstream 
P/N 1159SCH231-33 with Eaton/Sterer P/N 65940-1, unless that valve 
has been modified in accordance with paragraph (b) of this AD.

Alternative Methods of Compliance

    (d) 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, Atlanta Aircraft Certification 
Office (ACO), FAA. Operators shall submit their requests through an 
appropriate FAA Principal Maintenance Inspector, who may add 
comments and then send it to the Manager, Atlanta ACO.

    Note 4: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Atlanta ACO.

Special Flight Permits

    (e) 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.

Incorporation by Reference

    (f) With the exception of the general visual inspection required 
by paragraph (a) of this AD, the actions shall be done in accordance 
with Gulfstream G-II Alert Customer Bulletin No. 27, dated March 20, 
2001; Gulfstream G-III Alert Customer Bulletin No. 13, dated March 
20, 2001; Gulfstream G-IV Alert Customer Bulletin No. 27, dated 
March 20, 2001; and Gulfstream G-V Alert Customer Bulletin No.12, 
dated March 20, 2001; as applicable. This incorporation by reference 
was approved previously by the Director of the Federal Register as 
of May 10, 2001 (66 FR 20734, April 25, 2001). Copies may be 
obtained from Gulfstream Aerospace Corporation, P.O. Box 2206, M/S 
D-10, Savannah, Georgia 31402-9980. Copies may be inspected at the 
FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington; at the FAA, Atlanta Aircraft Certification Office, One 
Crown Center, 1895 Phoenix Boulevard, suite 450, Atlanta, Georgia; 
or at the Office of the Federal Register, 800 North Capitol Street, 
NW., suite 700, Washington, DC.

Effective Date

    (g) The effective date of this amendment remains May 10, 2001.

    Issued in Renton, Washington, on June 21, 2001.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 01-16203 Filed 6-28-01; 8:45 am]
BILLING CODE 4910-13-P