P. O. BOX 190409 • ANCHORAGE, ALASKA 99519-0409 

INTRODUCTION 

PHONE (907) 344-1755 

IliST.ALLA!'ION IllSTRUCTIOHS HO. 3233-I 

FOR MODIFIED PIPER WDIG LIFT STRUTS 

S.T.C. No. SA4635NM 

February 1, 1991 

Page 1 of 3 

The Piper wing lift struts whose installation is approved by F. Atlee Dodge 

Aircraft Services, Inc. S.T.C. No. SA4635NM have been modified as follows to 

accomplish the purposes described: 

(1) A visual inspection of the wing lift strut interiors has been performed 

and the struts have been repaired or replaced as necessary. The 

protective treatment specified by AD 77- 03- 08, Paragraph (a), has been 

applied in order to impede corrosion of the strut interiors, and both 

ends of the struts have been hermetically sealed per S.T.C. No . · SA4635NM 

in order to prevent moisture from entering the struts. 

(2) Heavy- duty lift strut forks, jam nuts, and barrel assemblies have been 

installed per the applicable Jensen Aircraft S.T .C. (see Table 1 on Page 

3) and "NO STEP" placards have been affixed to the struts per S.T.C. No. 

SA4635NM, in order to prevent bending and/or cracking of the lift strut 

forks. The "NO STEP" placards are required by Paragraph (c) of AD 

81-25-05. 

LIFT STRUT INSTALLATION INSTRUCTIONS 

These ins~allation instructions apply only to wing lift struts modified by F. 

Atlee Dodge Aircraft Services, Inc. or by Jensen Aircraft per F. Atlee Dodge 

S.T.C. No. SA4635N}1. Lift struts so modified are identified by a data plate, 

tack welded to the upper end of each strut, inscribed with the name "F. Atlee 

Dodge" and the date modified. A tag is attached to each modified lift s1:rut 

shipped, specifying whether or not the modifier was able to adjust the fork to 

preserve the original strut leng1:h. In cases where the original stru1: length 

was unknown, or otherwise could not be preserved, the modifier has adjusted 

the fork so that approximately half the threaded portion of the shank is 

within the barrel. Each modified lift strut is shipped with the fork jam nut 

torqued to 40 foot-pounds, to preserve the fork adjustmen~ and the strut 

hermetic seal during shipping and storage. 

(1) Remove all shipping tags and install each modified lift strut en the 

airplane in its proper loca'tion, with the "NO STEP" placard facing upward 

so it can be r ead by persons entering and exiting the airplane. All lift 

stru1: attaching hardware other than the heavy-duty fork and its jam nut, 

must be identical to that originally specified for the airplane. The 

fork jam nut may have to be loosened during installation in order to 

- . --·-. ~ • • , ,.. ........ A OQ/"'OI\C"I" CAf:lT<; • FUEL T ~NKS • A /C SKIS • ANO MISCELLANEOUS OTHER A/C PARTS 
F. Atlee Dodge Aircraft Services, Inc. 

P.O • . Box 190409 

Anchorage, Alaska 99519-0409 

MAINTENANCE AND INSPECTION INSTRUCTIONS 

)233-I 

February 1 , 1991 

l?age ) of 3 

The installation of li1't struts modii'ied per F. Atlee Dodge Aircraft Services 

S.T.C. No. SA4635Nl1 does not in any way diminish the responsibility of the 

airplane owner and the mechanic for exercising due care in ~he maintenance and 

inspection of each modified lift strut, fork, jam nut, and barrel assembly . 

These components must be properly inspected and maintained to remain in 

airworthy condition, as must any aircra£t pa~. Lift struts must be 

maintained and inspected in accordance with Piper Aircraft Corporation Service 

Bulletin No. 528C dated October 11, 1989, or No. 910A dated October 10, 1989, 

as applicable, and must be inspected as required by AD 77-03-08 as amended 

effective July 31, 1978. If any corrosion is found on a li£t strut fork, it 

must be replaced. Any failure of a modified lift strut, fork, jam nut, and/or 

barrel assembly must be reported to your local FAA Flight Standarns District 

Office or Flight Standards Field Office, and to the lift strut modifier. 

Piper 

Model 

PA-12 

PA-14 

PA-16 

PA-18 

PA-20 

PA-2.2 

Piper Rigging Service 

Hemo Humber 

a 

9 

18 

19 

20 

20 & 21 

TABLE 1 

Jensen Aircraft 

S.T.C. Number 

SA1583Nl>1 

SA1584NH 

SA1590Nr1 

SA1585NM 

SA1586NM 

SA1587N!1 

F. Atlee Dodge 

S.T.C. Number 

SA4635NM 

SA4635NM 

SA4635NI·1 

SA4635NI1 

SA4635NH 

SA4635NM