AD 80-09-03 R1

80-09-03 R1 BEECH: Amendment 39-3759 as amended by Amendment 39-3807. Applies to the following models and serial numbers of airplanes certificated in all categories having a Beech installed oxygen system:

GROUP I

MODEL SERIAL NUMBERS B90 LJ-490 thru LJ-501 C90 LJ-502 thru LJ-667 E90 LW-1 thru LW-326 H90 (Military T-44A) LL-1 thru LL-53 200 BB-2, BB-6 thru BB-185, BB- 187 thru BB-202, BB-204 thru BB-269, BB-271 thru BB-407, BB-409 thru BB- 468, BB-470 thru BB-482, BB-483 thru BB-488, BB-490 thru BB-509, BB-511 thru BB-518. 200T BT-1 thru BT-7 200C BL-1 and BL-2 A200 (Military C-12A) BC-1 thru BC-61 and BD-1 thru BD-30 A200 (Military C-12C) BC-62 thru BC-71

GROUP II

MODEL SERIAL NUMBER C90 LJ-668 thru LJ-851 100 B-2 thru B-89 and B-93 A100 B-1, B-90 thru B-92, B-94, B- 100 thru B-247, except B-205 A100 (Military U-21F) B-95 thru B-99 B100 BE-1 thru BE-70

COMPLIANCE: Required as indicated, unless previously accomplished.

To prevent seizure and binding of the oxygen control cable due to freezing of contaminating moisture which will interfere with actuation of the oxygen system, within the next 50 hours time-in-service after the effective date of this AD, accomplish the following:

A) On airplanes listed in GROUP I of the applicability statement, locally fabricate, using letters at least 3/32" high, and install in clear view of the pilot, a placard which reads as follows:

"Flight above 25,000 feet prohibited unless the oxygen system is ARMED (ON)." and operate the airplane in accordance with this limitation.

B) On airplanes listed in Group II of the applicability statement, locally fabricate, using letters at least 3/32" high, and install in clear view of the pilot, a placard which reads as follows:

"Flight above 25,000 feet prohibited unless the occupants are using oxygen" and operate the airplane in accordance with this limitation.

C) Install a copy of theAD in the Limitation Section of the AFM of the airplanes listed in Group I and Group II of the applicability statement.

D) The installation of the required placard and insertion of this AD may be accomplished by the holder of a pilot certificate issued under Part 61 of the Federal Aviation Regulations on any airplane owned or operated by that person, who must make an entry in the airplane maintenance records indicating compliance with this AD.

E) The placards specified herein may be removed from the airplane and a copy of the AD removed from the AFM upon modification of the airplane in accordance with Beechcraft Service Instructions No. 0867-341, Revision II, Part I, and recording of compliance with this paragraph in the airplane maintenance records.

NOTE: The Beech Model H90 (Military T-44A), A100 (Military U-21F, S/N B-95 through B-99) and A200 (Military C-12A and C-12C) airplanes utilize P/N 90-384020-7, P/N 90- 384020-9 and P/N 90-384020-11, respectively, as replacement oxygen cable assemblies. These military airplanes and P/N 90-384020-11 cable assembly are not listed in Beechcraft Service Instruction No. 0867-341, Revision II. However, the replacement cable assemblies may be installed in these airplanes in accordance with said Service Instructions if removal of the placards is desired.

F) Any equivalent method of compliance must be approved by the Chief, Aircraft Certification Program, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209.

Amendment 39-3759 became effective May 1, 1980.

This Amendment 39-3807 becomes effective June 11, 1980.