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) 824-9421 
0 

.c 
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 9 
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 
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 9 
GU

( 11) Tern porarily place new KRJ8-UDYB-016 bearing in LH/RH 27-21169-007 fitting 

and check for proper fit in LH/RH 26-21065 bracket. 

NOTE: It is permissible to remove a maximum of two (2) rivets if their location 

interferes with top of fitting or bearing, rivet hole(s) may be left open. 

(12) Remove KRJ8-UDYB-016 bearing from LH/RH 27-21169-007 fitting. 

(13) Temporarily install LH/RH 27-21169-007 fitting and using outer fastener holes 

in fitting as guides, drill 0.190 to 0.194 inch diameter hole through LH/RH 

26-21 065 bracket, 4 places. 

(14)Remove LH/RH 27-21169-007 fitting and deburr holes in LH/RH 26-21065 

bracket, 4 places. 

(15) Locate SAT1518tooljig onto LH/RH 26-71004 bearing cup on control column, 

tighten at desired position (0° to 90°) and drill 0.125 to 0.129 inch diameter hole 

through both sides of cup, as shown in FIGURE 2. 

(16) Remove tool jig and deburr holes. 

(17) Repeat Steps 2.A. (2) through (16) for opposite side. 

B. Installation 

(1) Locate MS21 073L3 nutplate on outboard side of LH/RH 27-21169-007 fitting, 

8 places and drill 0.097 to 0.102 inch diameter hole, 2 places each nutplate, 

deburr holes, 16 places. Countersink inboard side of nutplate fastener holes, 

1 ooo x 0.175 to 0.183 inch diameter, 16 places, as shown in FIGURE 2. 

(2) Install MS21073L3 nutplate, using 2 each, MS20426AD3-() rivets on outboard 

side of LH/RH 27-21169-007 fitting, 8 places, as shown in FIGURE 2. 

(3) Clean bearing hole of LH/RH 27-21169-007 fitting and KRJ8-UDYB-016 bearing, 

install bearing from flat side of fitting, using LOCTITE 609. 

(4) Install LH/RH 27-21169-005 pin into LH/RH bearing cup, align bearing cup/pin 

holes, install MS171532 spring pin and safety in accordance with MS33540 

using MS20995C32 lockwire. 

Issued: June 16, 1997 26-27-30-04 7 

Page 4 of 9 
' 

(7) Repeat Steps 2.8. (1) through (6) for opposite side. 

(8) Perform elevator functional check, as described in SA26 MM. 

(9) Replace all cockpit furnishings and floorboards removed to accomplish this 

inspection/replacement. 

C. Complete aircraft records according to F.A.R. 43.9. 

D. Complete and mail Service Bulletin compliance form. 

Issued: June 16, 1997 26-27-30-047 

Page 5 of 9 
bulletin. SB26-27-30-047 Kit A or B can be ordered and will contain all materials listed 

except common stock items which may be obtained locally or ordered separately. 

KIT A- Contains SAT1518 Tool Jig, Control Column. 

NEW PIN QTY. KEYWORD OLD PIN 

SAT1518 1 

26-27-30-047-PL-A 1 

Tool Jig, 

Control Column 

Packing List 

N/A N/A 

DISPOSITION 

N/A N/A 

KIT B - Contains Parts for One Ship Set, Except Common Stock Items. 

NEW P/N QTY. KEYWORD OLD P/N DISPOSITION 

27-21169-007 2 Fitting 26-21352-001 ' Scrap 

-005, -007 or -007P 

27-21169-005 2 Pin CF-5/8-S Scrap 

AN3-4A * 16 Bolt AN3-5A Scrap 

AN960-10L * 16 Washer AN960-10L Scrap AN960C816 * AIR Washer AN960C416 Scrap 

AN960C816L * AIR Washer AN960C416L Scrap 

KRJB-UDYB-016 § 2 Bearing N/A N/A 

MS171532 2 Spring Pin N/A N/A 

MS21073L3 * 16 Nutplate N/A N/A 

MS20426AD3-() * 32 Rivet MS20426AD3 Scrap 

609 * AIR LOCTITE N/A N/A 

26-27-30-047-PL-B 1 Packing List N/A N/A 

* Indicates materials are common stock items which will not be included in the kit. 

These parts may be obtained locally or ordered separately. 

§ Indicates KAMATICS Part Number. 

Issued: June 16, 1997 26-27-30-04 7 

Page 6 of 9 
'----INCREASE EXISTING 0. 750 iNCH DIAMETER ---...J 

HOLE TO 1.00 INCH DIAMETER HOLE. 

EXISTING 26·21352·001/.005/-007 OR ·007P DOUBLER ASSEMBLY 

COPILOTS SIDE, LOOKING DOWN COPILOTS SIDE, LOOKING OUTBOARD 

(PILOTS SIDE OPPOSITE) (PILOTS SIDE OPPOSITE) 

EXISTING 26·21352·001/-005/·007 OR ·007P DOUBLER ASSEMBLY 

COPILOTS SIDE, LOOKING OUTBOARD COPILOTS SIDE, LOOKING FORWARD 

(PILOTS SIDE OPPOSITE) (PILOTS SIDE OPPOSITE) 

(1) REMOVE CF-5/8-S ROLLER BEARING AND 4 NUTPLATES, IF INSTALLED, FROM 

26-21352 DOUBLER. 

(2) INSTALL ROLLER BEARING ON OPPOSITE SIDE OF DOUBLER. 

(3) POSITION DOUBLER ONTO INBOARD SIDE OF NEW 27·21169·007 FITTING. 

(4) CLAMP DOUBLER AND FITTING TOGETHER, MATCH DRILL FITTING, 

0.190 TO 0.1941NCH DIAMETER HOLE, 4 PLACES, USING EXISTING FASTENER 

HOLES IN DOUBLER AS GUIDE. 

Issued: June 16, 1997 

CONTROL COLUMN IMPROVED PIVOT 

INSTALLATION INSTRUCTIONS 

FIGURE 1 

I 2682704111 

26-27-30-04 7 

Page 7 of 9 
INSTALL MS171532 SPRING PIN, 

SAFETY USING MS20995C32 

LOCKWIRE. 

AN3-4A BOLT 

AN960-10L WASHER 

8 PLACES 

INSPECT 26-21 065 BRACKET 

FOR CRACKS. IF ANY CRACKS 

ARE FOUND, REMOVE AND 

REPLACE BRACKET. 

COPILOTS CONTROL COLUMN 

(PILOTS SIDE OPPOSITE) 

27-21169-007 FITIING 

SHOWN WITH, 

KRJB-UDYB-016 BEARING 

INSTALLED. 

MS21 073L3 NUTPLATES 

OMITIED FOR CLARITY. 

DETAIL A 

(PILOTS SIDE OPPOSITE) 

(268270472( 

CONTROL COLUMN IMPROVED PIVOT 

INSTALLATION INSTRUCTIONS 

FIGURE 2 . 

Issued: June 16, 1997 26-27-30-047 

Page 8 of 9 
DIAMETER HOLE, 8 PLACES 

(4 PLACES MATCH DRILLED 

TO 26-21352 DOUBLER). 

(SHOWN FOR REFERENCE 

ONLY) 

27-21169-007 FITTING/ I 1.345 INCH I--

--11 .345 INCH <FWD I 

VIEW 8-8 

COPILOTS SIDE- LOOKING OUTBOARD 

(PILOTS SIDE OPPOSITE) 

KRJ8-UDYB-016 BEARING -----,\. 

INSTALL FROM ' 

FAR SIDE, USING .......--.---,.---!7':0h-----.-.... DRILL 0.097 TO 0.102 INCH 

DIAMETER HOLE, 2 PLACES 

EACH NUTPLATE. 

COUNTERSINK FAR SIDE OF 

FITTING, 1 ooo X 0.175 TO 0.183 

INCH DIAMETER, 16 PLACES. 

INSTALL MS21073L3 NUTPLATE 

ON NEAR SIDE OF FITIING, 

USING 2 EACH, MS20426AD3-( ), 

8 PLACES. 

LOCTITE 609. 

Issued: June 16, 1997 

VIEwC-C 

27-21169-007 FITTING 

COPILOTS SIDE • LOOKING INBOARD 

(PILOTS SIDE OPPOSITE) 

CONTROL COLUMN IMPROVED PIVOT 

INSTALLATION INSTRUCTIONS 

FIGURE 2, VIEW B·B AND C-C 

I 2682704 12e I 

26-27-30-04 7 

Page 9 of 9