TO: HOLDERS

OF SA26 SERIES SERVICE INFORMATION

MANUALS Attached

is SA26 Series Service Bulletin 27-30-047,

Control Column

Pivot Improvement,

Issued:

June

16, 1997. This Service Bulletin

(SB) provides operators

with

an improved

control column

pivot design

that adds strength

as well

as maintainability

to the installation.

This

is accomplished by replacement

of existing CF-5/8-S

roller bearing, 26-21352

doubler

with

a new 27-21169 control column

pivot. Inspect existing 26-21065

bracket

for cracks, remove

and replace bracket

if cracks

are found.

The new pivot consists

of

a 27-21169-007

fitting which

is provided undrilled (fastener

holes

to be picked

up from

old doubler),

a KRJS-UDYB-016 bearing (KARON)

is installed

in the fitting

with LOCTITE

609,

and 27-21169-005

pin

is installed

in the existing bearing

cup

on the control column,

pin installation

is accomplished by match drilling

the bearing

cup

to the

pin through-hole

(SAT1518

tool

jig available)

and installing

spring

pin and safety

wire. Also attached

is

a revised Chapter

27 Index,

Page

3 and

4. Please remove

the .old Chapter

27 Index,

Page

3 and

4 and replace

it with

the new Chapter

27 Index,

Page

3 and

4. FAIRCHIL-D AIRCRAFT P.O.
Box 790490

• San Antonio,

Texas 78279-0490

• (210) 824-94210.c**FAIRCHI~D** SA26 SERIES

AIRCRAFT SERVICE BULLETIN Flight Controls Control Column

Pivot Improvement 1. PLANNING INFORMATION A. Effectivity: All SA26 Series Airplanes B. Reason: To provide operators

with

an improved

control column

pivot design

that adds strength and improves

the maintainability

of the installation. C. Description: Replace existing CF-5/8-S

roller bearing, 26-21352

doubler

with new 27-21169

control column

pivot. Inspect existing

26-21

065 bracket

for cracks, remove

and replace bracket if cracks

are found.

The new pivot consists

of

a 27-21169-007

fitting which

is provided undrilled (fastener

holes

to be picked

up from

old doubler)

, a KRJS-UDYB-016

bearing (KARON)

is installed

ir, the fitting

with LOCTITE

609,

and 27-21169-005

pin

is installed in the existing bearing

cup

on the control column,

pin installation

is accomplished

by match drilling

the bearing

cup

to the

pin through-hole

(SAT1518

tool

jig available)

and installing

spring

pin and safety

wire. NOTE:

Kit

A will include SAT1518

tool

jig, control column,

and

Kit

B will include parts

for one ship

set. D. Compliance

: Highly Recommended,

accomplish

at next scheduled

access,

in conjunction

with Phase

or Letter Check Inspection. E. Approval: FAA Approved

for Engineering

Design

. F. Manpower: It

is recommended

that owners
obtain

an estimate

from their nearest Fairchild
Aircraft

(FA) authorized

Service Facility/Maintenance

Department. Issued:

June

16, 1997

26-27-30-04

7 Page

1 of

9FAIRCHil-D SA26 SERIES

AIRCRAFT SERVICE BULLETIN G. Material-Cost

and Availability: (1) Cost: Because

of pricing fluctuations,

individual

cost estimates

should

be obtained

from your normal material procurement

outlet. Additional

material

cost information

may

be contained

in the Index

or the Letter

of Transmittal. (2) Availability: Parts

are available. H. Tooling-Price

and Availability: No special tooling required. I. Weight

and Balance: Increase{+)

weight

0.16 pound, increase(+)

moment

15.37 inch-pounds. J. Reference: Fairchild
Aircraft

(FA) Drawing 26-71004, 26-21352, 27-21000

and 27-21169. NOTE: References

are

for manufacturers'

use only. K. Other Publications

Affected: None. Issued:

June

16, 1997

26-27-30-04

7 Page

2 of

9**FAIRCHI~D** SA26 SERIES

AIRCRAFT SERVICE BULLETIN 2. ACCOMPLISHMENT

INSTRUCTIONS A. Removals NOTE: Surface

finish

of bare metal, surface cleaning, fastener

hole drilling,

countersinks, deburring

and fastener installation

shall

be accomplished

as described

in SA226/227

Series Structural

Repair Manual

(SAM) Chapter 51, unless otherwise

noted. Clamp and/or Cleco

all parts

as they

are drilled to prevent

part shifting. (1) Remove
cockpit furnishings

and floorboards

as required

to gain access

to Pilots (LH)

and Copilots (RH)control

column

roller bearings. (2) Remove existing
LH/RH CF-5/8-S

control column

roller bearing

and 26-21352
doubler, scrap attaching hardware. NOTE:

Make

note

of washer

stack

up between

LH/RH

roller bearing

and doubler, these washers

were used

for shims

and

the same number

of AN960C816 and/or AN960C816L

washers

will need

to

be installed between

new KRJS-UDYB-016

bearing

and head

of 27-21169-005

pin

to maintain control column position

on final installation. NOTE: Removed

LH/RH 26-21352 doubler(s)

will

be used

to pick

up fastener holes

on new LH/RH 27-21169-007

fitting

and should

be marked

on removal

to avoid confusion

(LH,

RH,

up, down, forward,

aft, inboard, outboard). (3) Inspect
LH/RH 26-21065

bracket

for cracks,

no cracks allowed. Remove

and replace
LH/RH

26-21

065 bracket

if cracks

are found. (4) Remove

LH/RH

roller bearing

and nutplates

from 26-21352

doubler,

retain

roller bearing attaching hardware

and scrap nutplates. (5) Install

roller bearing

on opposite

side

of 26-21352

doubler

using previously removed hardware,

as shown

in FIGURE

1. (6) Push LH/RH

roller bearing

into bearing

hole

of LH/RH 27-21169-007

fitting

from inboard

side

(flat side),

align

so that

top

of 26-21352
doubler

is parallel

to top of fitting

and clamp

as required

to prevent movement during

drilling. (7) Using

the existing fastener

holes

in LH/RH 26-21352

doubler

as guides,

drill 0.190

to 0.194

inch diameter

hole through

LH/RH 27-21169-007

fitting (inner attach holes),

4 places,

as shown

in FIGURE

1. (8) Remove

clamp

from LH/RH 27-21169-007

fitting.

Scrap LH/RH 26-21352 doubler, bearing

and attaching hardware. Issued:

June

16, 1997

26-27-30-047 Page

3 of

9FAIRCHil-DSA26SERIESAIRCRAFTSERVICEBULLETIN(9)Layoutanddrill0.190to0.194inchdiameterholethroughLH/RH27-21169-007fitting(outerattachholes),4places,asshowninFIGURE2.Deburrholes,8places.(1O)Enlargeexistingbearingthrough-holeinLH/RH26-21065bracket,asshowninFIGURE1.(11)TernporarilyplacenewKRJ8-UDYB-016bearinginLH/RH27-21169-007fittingandcheckforproperfitinLH/RH26-21065bracket.NOTE:Itispermissibletoremoveamaximumoftwo(2)rivetsiftheirlocationinterfereswithtopoffittingorbearing,rivethole(s)maybeleftopen.(12)RemoveKRJ8-UDYB-016bearingfromLH/RH27-21169-007fitting.(13)TemporarilyinstallLH/RH27-21169-007fittingandusingouterfastenerholesinfittingasguides,drill0.190to0.194inchdiameterholethroughLH/RH26-21065bracket,4places.(14)RemoveLH/RH27-21169-007fittinganddeburrholesinLH/RH26-21065bracket,4places.(15)LocateSAT1518tooljigontoLH/RH26-71004bearingcuponcontrolcolumn,tightenatdesiredposition(0°to90°)anddrill0.125to0.129inchdiameterholethroughbothsidesofcup,asshowninFIGURE2.(16)Removetooljiganddeburrholes.(17)RepeatSteps2.A.(2)through(16)foroppositeside.B.Installation(1)LocateMS21073L3nutplateonoutboardsideofLH/RH27-21169-007fitting,8placesanddrill0.097to0.102inchdiameterhole,2placeseachnutplate,deburrholes,16places.Countersinkinboardsideofnutplatefastenerholes,1ooox0.175to0.183inchdiameter,16places,asshowninFIGURE2.(2)InstallMS21073L3nutplate,using2each,MS20426AD3-()rivetsonoutboardsideofLH/RH27-21169-007fitting,8places,asshowninFIGURE2.(3)CleanbearingholeofLH/RH27-21169-007fittingandKRJ8-UDYB-016bearing,installbearingfromflatsideoffitting,usingLOCTITE609.(4)InstallLH/RH27-21169-005pinintoLH/RHbearingcup,alignbearingcup/pinholes,installMS171532springpinandsafetyinaccordancewithMS33540usingMS20995C32lockwire.Issued:June16,199726-27-30-047Page4of9'FAIRCHil-DSA26SERIESAIRCRAFTSERVICEBULLETIN(5}InstallrequiredstackupofAN960C816and/orAN960C816Lwashers(determinedinStep2.A.(2)Note)ontoLH/RH27-21169-005pin.(6)PositionLH/RH27-21169-007fittingontoLH/RH27-21169-005pin,install8eachAN3-4AboltsandAN960-1OLwashers.(7)RepeatSteps2.8.(1)through(6)foroppositeside.(8)Performelevatorfunctionalcheck,asdescribedinSA26MM.(9)Replaceallcockpitfurnishingsandfloorboardsremovedtoaccomplishthisinspection/replacement.C.CompleteaircraftrecordsaccordingtoF.A.R.43.9.D.CompleteandmailServiceBulletincomplianceform.Issued:June16,199726-27-30-047Page5of9FAIRCHIL.DSA26SERIESAIRCRAFTSERVICEBULLETIN3.MATERIALLISTINGReplacementoralternatepartsapprovedviaFairchildAircraftdrawingsareacceptablesubstitutesforuseinaccomplishingthisbulletin.Thefollowingmaterialsarerequiredtoaccomplishtheinstructionsoutlinedinthisservicebulletin.SB26-27-30-047KitAorBcanbe orderedandwillcontainallmaterialslistedexceptcommonstockitemswhichmaybeobtainedlocallyororderedseparately.KITA-ContainsSAT1518ToolJig,ControlColumn.NEWPINQTY.KEYWORDOLDPINSAT1518126-27-30-047-PL-A1ToolJig,ControlColumnPackingListN/AN/ADISPOSITIONN/AN/AKITB-ContainsPartsforOneShipSet,ExceptCommonStockItems.NEWP/NQTY.KEYWORDOLDP/NDISPOSITION27-21169-0072Fitting26-21352-001'Scrap-005,-007or-007P27-21169-0052PinCF-5/8-SScrapAN3-4A*16BoltAN3-5AScrapAN960-10L*16WasherAN960-10LScrapAN960C816*AIRWasherAN960C416ScrapAN960C816L*AIRWasherAN960C416LScrapKRJB-UDYB-016§2BearingN/AN/AMS1715322SpringPinN/AN/AMS21073L3*16NutplateN/AN/AMS20426AD3-()*32RivetMS20426AD3Scrap609*AIRLOCTITEN/AN/A26-27-30-047-PL-B1PackingListN/AN/A*Indicatesmaterialsarecommonstockitemswhichwillnotbeincludedinthekit.Thesepartsmaybeobtainedlocallyororderedseparately.§IndicatesKAMATICSPartNumber.Issued:June16,199726-27-30-047Page6of9SA26SERIESAIRCRAFTSERVICEBULLETIN'----INCREASEEXISTING0.750iNCHDIAMETER---...JHOLETO1.00INCHDIAMETERHOLE.EXISTING26·21352·001/.005/-007OR·007PDOUBLERASSEMBLYCOPILOTSSIDE,LOOKINGDOWNCOPILOTSSIDE,LOOKINGOUTBOARD(PILOTSSIDEOPPOSITE)(PILOTSSIDEOPPOSITE)EXISTING26·21352·001/-005/·007OR·007PDOUBLERASSEMBLYCOPILOTSSIDE,LOOKINGOUTBOARDCOPILOTSSIDE,LOOKINGFORWARD(PILOTSSIDEOPPOSITE)(PILOTSSIDEOPPOSITE)(1)REMOVECF-5/8-SROLLERBEARINGAND4NUTPLATES,IFINSTALLED,FROM26-21352DOUBLER.(2)INSTALLROLLERBEARINGONOPPOSITESIDEOFDOUBLER.(3)POSITIONDOUBLERONTOINBOARDSIDEOFNEW27·21169·007FITTING.(4)CLAMPDOUBLERANDFITTINGTOGETHER,MATCHDRILLFITTING,0.190TO0.1941NCHDIAMETERHOLE,4PLACES,USINGEXISTINGFASTENERHOLESINDOUBLERASGUIDE.Issued:June16,1997CONTROLCOLUMNIMPROVEDPIVOTINSTALLATIONINSTRUCTIONSFIGURE1I268270411126-27-30-047Page7of9SA26SERIESAIRCRAFTSERVICEBULLETININSTALLMS171532SPRINGPIN,SAFETYUSINGMS20995C32LOCKWIRE.AN3-4ABOLTAN960-10LWASHER8PLACESINSPECT26-21065BRACKETFORCRACKS.IFANYCRACKSAREFOUND,REMOVEANDREPLACEBRACKET.COPILOTSCONTROLCOLUMN(PILOTSSIDEOPPOSITE)27-21169-007FITIINGSHOWNWITH,KRJB-UDYB-016BEARINGINSTALLED.MS21073L3NUTPLATESOMITIEDFORCLARITY.DETAILA(PILOTSSIDEOPPOSITE)(268270472(CONTROLCOLUMNIMPROVEDPIVOTINSTALLATIONINSTRUCTIONSFIGURE2.Issued:June16,199726-27-30-047Page8of9FAIRCHil-DSA26SERIESAIRCRAFTSERVICEBULLETIN26-21352DOUBLERDRILL0.190TO0.194INCHDIAMETERHOLE,8PLACES(4PLACESMATCHDRILLEDTO26-21352DOUBLER).(SHOWNFORREFERENCEONLY)27-21169-007FITTING/I1.345INCHI--<FWDI--11.345INCHVIEW8-8COPILOTSSIDE-LOOKINGOUTBOARD(PILOTSSIDEOPPOSITE)KRJ8-UDYB-016BEARING-----,\.INSTALLFROM'FARSIDE,USING.......--.---,.---!7':0h-----.-....DRILL0.097TO0.102INCHDIAMETERHOLE,2PLACESEACHNUTPLATE.COUNTERSINKFARSIDEOFFITTING,1oooX0.175TO0.183INCHDIAMETER,16PLACES.INSTALLMS21073L3NUTPLATEONNEARSIDEOFFITIING,USING2EACH,MS20426AD3-(),8PLACES.LOCTITE609.Issued:June16,1997VIEwC-C27-21169-007FITTINGCOPILOTSSIDE•LOOKINGINBOARD(PILOTSSIDEOPPOSITE)CONTROLCOLUMNIMPROVEDPIVOTINSTALLATIONINSTRUCTIONSFIGURE2,VIEWB·BANDC-CI268270412eI26-27-30-047Page9of9