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JENSEN AIRCRAFT 

INSTRUCTIONS FOR 

' 

MODIFIED LIFr STRUT FITTINGS 

6.23 

7-15- 83 

Revised 3- 30- 84 

Revised 4- 20- 84 

Revised 5- 15-84 

Revisions 

Introduction 

Eligibility 

Required Parts 

Requir ed Drawings 

Required Tools and Equipment 

Procsdures 

Installation 

Documentation 

Conclusion 

Apper.dix 
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Page a Dated 7-15-83 

Revised 3- 30-84, Revised 4-20-84, Revised 5- 15- 84 

REVISIONS TO INSTALLATION INSTRUCTIONS 

THIS PAGE SHOWS LATEST REVISIONS INCORPORATED IN THE INSTALLATION INSTRUCTIONS 

REVISION/I REVISED PAGES DATE 

- --·----- ··· 1 2,3,4,6 3/30/84 

2 a,3 4/20/84 

3 3 pal:. 7 and 9 5/15/84 

) 

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Page 1 Dated 7-15-83 

INSTALLATION INSTRUCTIONS FCR JENSEN LIFT STRUT FITTING 

INTRODUCTION: . . 

The Jensen lift strut fitting is designed to reduce stress in the 

threaded section. of the lift strut fork by providing a large crosssection through the threaded shank. I·t can be installed by any competent 

shop with the proper tools and personel who. have reasonable welding 

skills. Installation is simple, the original lift strut barrel is 

removed from the lift strut and replaced with the Jensen barrel by welding. 

ELIGIBILITY: 

The modification may be done to lift struts on the following aircraft. 

AIRCRAFT LIFT STRUT POSITION :tcLIFT STRUT PART NUMBER 

J-5 Front 10098- 00 

PA-12 Front 10098-00 

Rear 10096-00 

PA-14 Front 10098-00 

Rear 10096-00 

PA- 16 Front 11773-00 

Rear 11774-00 

PA-18 Front 10098-03 

Rear 10096-03 

PA-20 Front ll773-03 

Rear l1774-00 

PA-22 Front l1773-00 

Rear 11774-00 

* PMA, certified replacement lift struts for these 

part numbers are also eligible. 

REQUIRED PARTS: 

The following parts are required for each lift strut modified. 

1. Jensen 006 . 01 Strut Fork 

2. Jensen 006.02 Barrel Assembly 

3. Jensen 006.03 Jam Nut 
Page 2 Dated 7- 15-83 Revised 3/30/84 

REQUIRED DRAWINGS: 

DRAWING fl APPLICATION 

6- 773A Front Strut PA- 16, PA- 20, PA- 22 

6-774A Rear Strut PA-16, PA-20, PA-22 

6-096A Rear Strut PA- 12, PA-14, PA-18 

6- 098A Front Strut PA- 12, PA-14, PA-18, J-5 

6.20-T1 Shows tool set up for each strut 

REQUIRED TOOLS AND EQUIPMENT: 

In addition to normal mechanics hand tools, the following special 

tools are required for installation: 

Alignment Tools: 1. _}ensen __ 6. 20-T1 Barrel- Strut Alignment Tool 

2. Jensen 6.21-T2 Light Template 

Shop Tools: 

Supplies: 

PROCEDURES : 

1. Good quality oxygen acetylene welding torch 

or Heliarc - TIG welder. 

2. Strong Fl~shlight 

3 . High- speed, hand- held cut off saw with 3" 

x l/32 ·:>r l/16" thick cutting wheel _ _ _ 

(Florid3 Pneumatic FP3801-A or Dotco 10- 10 

series grinders will make a good cut off saw.) 

l. Welding Rod - Linde 01 or 32CMS, 1/ 16" 

2. Silver Marking pencil (art pencil with no 

graphite in "lead".) 

3. Linseed oil, Lion-oil, Val oil or alternate 

preservative - See Piper Service Bulletin 

No . 528B in appendix A. 

4 . . Anti r;ieze compound ( Armite Laboratories NO . 250 

or equivalent ) 

A. Before removing struts for modification: 

l . Make sure you have the nec~ssary parts to use tool 6.20-Tl. 

See drawing 6 . 20-Tl for proper tool set up. 

2. Inspect the struts while they are still on the aircraft for 

general condition; dents, gouges, rust, etc. Reject struts 

that are unairworthy. 

3. Place a piece of masking tape approximately 3" long on the top 

of each strut 8" from the fuselage attach bolt. Place the tape 

on the strut fork cen.terline parallel with the strut . Make an 

index mark on each strut 8" from the center of the forkbolt. 

Place transparent tape over the index mark to prevent erasing 

it while handling the strut. The index marks will allotv you to 

reposition the struts without re-rigging the aircraft. 

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Page 3 Dated 7-15- 83 Revised 4-20- 84 

B. Modificaeion of lift struts: 

1. Remove origi~al fork and jam nut and drain any preservative oil from 

the strut. 

2. Strip paint from lower 3 inches of lift strut. 

3. The tools are used as follows: 1. Before removing the original fork, 

drop a 3/8" bolt thru the fork and locator, then make a mark at the 

end of the locator on the lift strut. After the new barrel is installed 

screw the new fork in until t he end of the lo.cator lines up with the 

mark on the strut. The modified str ut will now be the same hole-tohole length as the un-modified strut . 2. With the lift strut secured 

in the alignment tool, place the cutting template on the top surface 

of the alignment tool and mark the strut parallel to its long axis 

using the two notches to guide . your pencil. The distance from the top 

notch to the top of the tool is approximately 2 3/8" and can be used to 

mark the end of the cutout. Cutting along the lines you have made will 

gi;re you a good f i t adequate for the job. 

4. Cut through the strut wall along the marked lines using the hand held 

abrasive saw. Remove the old barr el assembly . 

5 . Inspect the inside of t he strut for corrosion. If corrosion is found see 

Piper Service Bulletin 528B in appendix A. On PA- 18 aircraft this visual 

inspection may replace the inspection required by A.D . 77-03-08. 

6 . Coat the 7/8-20 threads of tool 6.20- T1 with an antisieze compound. 

(Armite Laboratories Led- Plate No . 250 or equivalent. This type antisieze is available from machine tool supply houses for lubrication 

dead centers and p~pe threads . ) 

7. The 006 . 02 Barrel Assembly is made with one lengthwise welded seam. This 

seam is left incomplete to allow venting of the barrel cavity during welding. Thread the barrel onto the -2 -barrel l ocator assembly with the 

incomplete weld towards the aircraft end of the lift strut and the lengthwise welded seam located inside the lift strut so it will not be visable. 

8 . See the appropriate installation drawing for the lift strut you are 

modifying and fit the strut to the bar rel. 

9. Welding barrel to lift strut: 

a . Tack weld the barrel to the lift strut with 4~" tack welds. DO NOT 

TACK WELD OVER THE THREADED AREA OF THE - 2BARREL LOCATOR, YOU MAY 

CAUSE THE THREADS- TO SEIZE. 

b. Screw the - 2 locator out until no threads are engaged with the barrel . 

Finish as much weld as poss:i.ble in the tool. 

c. Remove and complete welds. DO NOT FORGET TO WELD SHUT THE VENT HOLE . 

10. Inspect the welds. Clean and paint the strut end. Note the "NO-STEP" 

sign required by A.D. 81-25-05 (Appendix C) must remain on the lift strut. 

11 . Apply corrosion preventive oil to the l i ft strut accordj,ng to Piper 

Service Bulletin 528B . 

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Page 4 Dated 7-15- 83 Revised 3/30/84 ., , 

INSTALLATION: 

1. Install 006 . 03 jam nut and 006.01 fork in the lift strut. 

2. Adjust the fork by screwing it in or out until the center of the 

fuselage attach bolt hole is 8" from the index mark made earlier. 

Following the above procedure will insure that the lift strut 

assemblies retain their original length and re-rigging the aircraft 

will not be necessary . 

a. If you are installing new or replacement l ift struts be careful 

to remove the original struts without disturbing the fork 

adjustment, you can then compare strut lengths to avoid 

re-rigging the aircraft . 

b. If you have lost your index, or need to re-rig the aircraft 

refer to the appendix for rigging instruction for your 

aircraft . ___ ., ____ .. - - - - ---

3 . Install the lift struts on the aircraft, after the fuselage -attach 

belt has been installed . Torque the 006.03 jam nut to 60 ft/lb. 

DOCUMENTATION: 

1. If you modified the original struts. -· ~ --'i~- -- -- -- ···-- . ·----- ·-- - ----·- - ···-- -- . .... . 

a. Complete a form 337 "Major Repair or Alteration" to document 

the strut alteration. (A repair station may use their internal 

documentation if they are rated for this type of alteration. ) 

i . That the lift struts were modified according to the 

appropriate S.T.C. and that a 337 form was completed. 

ii. That the lift struts were inspected visually for internal 

corrosion. 

iii. That the lift strut was treated for corrosion prevention 

according to Piper Service Bulletin 528B. 

iv. That Jensen 006 . 01 Strut Fork and 006 . 03 jam nut were 

installed according to the appropriate S.T.C. 

v. If the aircraft was rigged -- State that it was rigged in 

accordance with the proper service memo. 

2. If you installed new modified lift struts make logbook entries stating: 

a. That new lift struts P.N. ( see appendix N ) were installed according to 

the appropriate S.T.C. 

b. That Jensen 0.06.01 Strut Fork and 006.03 jam nut were installed 

according to the appropriate s.r.c. c. If the .aircraft was rigged - - State that it was rigged in 

accordance with the proper service memo. 

·3. Make a logbook entry stating th.at compliance with A.D. 81- 25- 05 is 

not required as per the appropriate S.T.C. 

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. Page 5 Dated 7- 15- 83 

CONCLUSION: 

Installation of the Jensen 006.01 lift strut fork does not in any 

way release the aircraf t owner or the mechanic from their responsibility 

to exercise prudent and careful maintenance and inspection procedures 

for the modified lift strut, 006 . 01 fork or 006.03 jam nut. These parts 

must be inspected and maintained to remain in airworthy condition as 

must any aircraft part. Any corrosion on the fork is cause for its 

replacement. Lift struts should be maintained according to Piper 

Service Bulletin 528B. Any failure of any of these parts should be 

reported to your local FAA maintenance office or to:Jensen Aircraft! 
. Page 6 Dated 7- 15-83 Revised 3/30/84 

APPENDIX TO INSTALLATION INSTRUCTIONS FOR JENSEN LIFT STRUT FITTING 

APPENDIX 

A 

B 

c 

D 

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F 

G 

H 

I 

J 

K 

L 

M 

SUBJECT 

Piper Service Bulletin 528B 

Illustrated use of light template 

A. D. 77- 03-08 

A.D. 81-25-05 

Piper Service Memo 7 J-5 .Rigging 

Piper SerVice Memo 8 PA-12 Rigging 

Piper Service Memo 9 PA- 14 Rigging 

Piper Service Memo 18 PA-16 Rigging 

Piper Service Memo 19 PA-18 Rigging 

Piper Service Memo 20 PA- 20 Rigging 

Piper Service Memo 21 PA-22 Rigging 

List of Drawings and Tools required for 

installation of lift strut forks 

List of Supplemental Type Certificates 

··- ~- --- ·---__ .... -

N Part numbers of new modified lift struts 

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