# Bombardier Service Bulletin 8-24-84

Copy: Revision D ("SB 8-24-84D released"), 21 pages: PDF https://openairdocs.org/files/sha256/ff/66/ff66c938cc26ef83962f3b559c04209fd76ffad5a64ef6b5ea3e1344a656f123; text https://openairdocs.org/service-documents/bombardier/sb-8-24-84/file/ff66c938cc26.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2015-1985; AD 2015-21-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Bombardier](https://openairdocs.org/service-documents/bombardier.md)
- Type: Service bulletin (Service Bulletin)
- Number: 8-24-84
- Latest revision known: 8-24-84, Revision D, dated April 10, 2014 (OpenAirDocs)
- Page: https://openairdocs.org/service-documents/bombardier/sb-8-24-84

## ADs that cite it (1) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2015-21-02](https://openairdocs.org/ad/2015-21-02.md), effective Nov 24, 2015: Revisions A, B, C and D

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-8-24-84/proposed.md).

## Text (21 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2015-1985; AD 2015-21-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

Revision ‘D’ 10 Apr 2014
D H C --- 8 ( D A S H 8 )
S E R V I C E B U L L E T I N 8 --- 2 4 --- 8 4
Electrical Power - - - DC System - - - Introduction of New Phoenix GCU Part
Number with Undervoltage Protection and Performance Improvements,
#1 Engine Generator Channel - - - ModSum 8Q101710
This page transmits Revision ‘D’ of Service Bulletin 8- - -24- - -84, pages 1 thru
18 dated 10 Apr 2014
This service bulletin is re- - -issued in its entirety for the reasons that follow:
--- t h eEffectivity section is revised
- - - added new statement after the Production Effectivity
--- Approval section is revised to add the statement for Airworthiness
Limitations (AWLs) and Damage T olerance Inspections (DTIs)
--- Manpower section is revised to include a breakdown of the time required
and on- - -site labor assistance information
--- t h eReferences section is revised to convey the latest revision of the service
bulletin and engineering documentation.
--- t h eParts Required Per Aircraft section is revised with statement in the
Remarks column of the Parts List for label 81151169
--- t h eExisting Parts Accountability section is revised with additional Existing
Part Number
--- t h eACCOMPLISHMENT INSTRUCTIONS section is revised with the
changes that follow:
--- s e p a r a t e dProcedure section into Part 1 and Part 2
- - - added ‘or GC- - -1010- - -24- - -5II’ to step (1) ofPart 1.
The Compliance in the previous issue(s) of this service bulletin is not
affected by this revision. No additional rework to the aircraft is introduced by
this revision.
Operators that have incorporated Revision ‘C’ of this service bulletin are not
required to do any further work. No additional rework to the aircraft is
introduced by this revision.
Remove Service Bulletin 8- - -24- - -84 Revision ‘C’ dated 07 Jul 2009 and
replace with attached.

### Page 2

Previous issue(s) of Service Bulletin 8- - -24- - -84:
Initial issue - - - Pages 1 thru 10 dated 22 Aug 2008
Revision ‘A’ - - - Pages 1 thru 10 dated 23 Aug 2008
Revision ‘B’ - - - Pages 1 thru 10 dated 15 Oct 2008
Revision ‘C’ - - - Pages 1 thru 10 dated 07 Jul 2009

### Page 3

(No text on this page.)

### Page 4

D
S . B . 8 --- 2 4 --- 8 4
Page 1 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
SERVICE BULLETIN
Customer
Support
ATA SYSTEM: 2461 NUMBER: 8- - -24- - -84
SUBJECT : Electrical Power - - - DC System - - - Introduction of New Phoenix GCU
Part Number with Undervoltage Protection and Performance
Improvements, #1 Engine Generator Channel - - - ModSum 8Q101710
1. PLANNING INFORMA TION
A. Effectivity
Aircraft Affected:
In- - -Service: DHC- - -8 Aircraft Models 102, 103, 106, 201, 202, 301, 311,
314 and 315 Serial Numbers 003 thru 661 with GCU part
number GC- - -1010- - -24- - -5DIII or GC- - -1010- - -24- - -5DII
installed.
Production: ModSum 8Q101710 has already been installed on applicable
DHC- - -8 Aircraft at Serial Number 662 and subsequent
For Serial Numbers 003 thru 661 with GCU part number 51539- - -008B or
51539- - -008C or 51539- - -008D installed, see Bombardier Service Bulletin 8- - -24- - -89.
Spares Affected:
None
B. Reason
Problem: Four occurrences of un- - -annunciated failure of the No. 1 DC Starter
Generator have been reported since 1995. This caused a low voltage
condition of the Left Main DC Bus and prompted emergency descents
and landings resulting from the illumination of numerous caution
indications of affected systems.

### Page 5

S E R V I C E B U L L E T I N 8 --- 2 4 --- 8 4
S . B . 8 --- 2 4 --- 8 4
Page 2 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
Functionality of the FMS and NAV systems were reportedly lost. The
transponder systems were also reported to no longer function with the
e x c e p t i o no ft h eN o .2A D F .
Given AC Bus and Main/Aux Battery architecture, this failure mode is
only applicable to the Left Main DC Bus and #1 Engine generator
channel.
Solution: This service bulletin conveys ModSum 8Q101710. The modsum installs
a new Generator Control Unit (GCU) with undervoltage protection,
added filtering to the current transformer inputs to address nuisance
trips and additional modifications designed to improve GCU
performance.
C. Description
The procedures in this service bulletin give the instructions to do the tasks that
follow:
- - - access is gained to the flight compartment
- - - the existing #1 Generator Control Unit (GCU) located on the bottom of the
co- - -pilots circuit breaker console is removed and replaced with a new GCU part
number GC- - -1010- - -24- - -5DV according to theACCOMPLISHMENT
INSTRUCTIONS in this service bulletin and the enclosed vendor service bulletin
- - - the existing connector label is removed and replaced with a new label
- - - a new GCU warning label is installed
- - - an operational test of the DC generator system is done
- - - close out.
D. Compliance
Bombardier Inc. recommends incorpora tion of ModSum 8Q101710 at the earliest
opportunity unless otherwise directed by the operator’s airworthiness authority.
E. Approval
The technical content of this service bulletin has been approved under the
authority of the Transport Canada Civil Aviation (TCCA) Design Approval
O r g a n i z a t i o n N o : D A O # 9 3 --- Q --- 0 2 .
This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage
T olerance Inspections (DTIs).

### Page 6

S E R V I C E B U L L E T I N 8 --- 2 4 --- 8 4
S . B . 8 --- 2 4 --- 8 4
Page 3 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
F. M a n p o w e r
It will take an estimated 3.00 man- - -hours to complete this service bulletin. The
breakdown of the man- - -hours is shown in the table that follows:
TASK M A N --- H O U R S
J o b S e t --- U p 0.50
Procedure 1.00
T e s t/R T S 1.00
Close- - -Out 0.50
For any on- - -site labor assistance, please speak with a Fleet Services representative for
a quote. The Fleet Services group can be contacted via the Q Series T echnical Help
Desk by telephone at 416- - -375- - -4000 or email at: thd.qseries@aero.bombardier.com
G. Material - - - Price and Availability
The part(s) and material(s) detailed in Paragraph(s) 2.A. may be either furnished or
fabricated from the operator’s existing stock, purchased as single items from
Bombardier Aerospace Regional Aircraft or purchased directly from industry
sources. DK parts are to be manufactured and approved locally (refer to disclaimer
in the related text or illustration). In some cases, an equivalent to the DK part may
be available from Bombardier under the production part number shown as
reference in Parts Required Per Aircraft.
H. T ooling - - - Price and Availability
None
I. Weight and Balance
None
J. Electrical Load Data
Not affected

### Page 7

S E R V I C E B U L L E T I N 8 --- 2 4 --- 8 4
S . B . 8 --- 2 4 --- 8 4
Page 4 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
K. Publications Affected
Dash 8 Illustrated Parts Catalogue PSM 1- - -8- - -4 and....................
P S M 1 --- 8 2 --- 4 a n d
P S M 1 --- 8 3 --- 4
Modifications Manual PSM 1- - -813- - -12...............................
L. References
Revision ‘D’ of this service bulletin was prepared to the engineering drawings and
related data that follows:
DRAWING SHEET REV
8DK4141 1 A
ModSum 8Q101710 Rev. ‘H’
Phoenix Aerospace Inc. Service Bulletin #: 000331- - -1 DATE: AUG 29/08
PCA 05625 Revision 5 (for internal reference only)
PCA 05918 Revision NC (for internal reference only)
Transport Canada Airworthiness Directive Pending.
2. MATERIAL INFORMA TION
A. Parts Required Per Aircraft
(1) Detailed Parts List:
Quantity
Per Aircraft
Part Number Description Remarks
1 81151169- - -101 Warning Label or operator manufactured
label 8DK4141- - -101
1 GC- - -1010- - -24- - -5DV GCU

### Page 8

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S . B . 8 --- 2 4 --- 8 4
Page 5 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
B. Parts Required to Modify Spares
None
C. Special T ools and Equipment Required
None
D. Existing Parts Accountability
The following parts may be affected by this service bulletin. Indented parts are
components of the next higher assembly. The quantity (Qty.) column lists the
quantity that may be affected per aircraft for non- - -indented parts and the quantity
p e rn e x th i g h e ra s s e m b l yf o ri n d e n t e dp a r t s .
Existing
Part Number Description Qty. IC DC
New Part
Number PNC
81151169- - -101 N
--- Warning Label 1 N/A N/A or
8DK4141- - -101 N
GC- - -1010- - -24- - -5DIII
or GCU 1 A SAL GC- - -1010- - -24- - -5DV N
GC- - -1010- - -24- - -5DII
IC Interchangeability Code
A Not interchangeable.
B Removed Part. No direct replacement.
C Conditionally Interchangeable. Inst allation of superseded part negates the
intent of this service bulletin.
N/A Not Applicable.
DC Disposition
DIS Discard Part.
MUI Multiple Usage Item: Return to stock if serviceable.
N/A Not Applicable.
RWK Rework existing part in accordance with this service bulletin.
RWI Rework existing part per .....
SAL Salvage. Return to operator’s stores for salvage consideration.
PNC Part Number Code
NN e w p a r t .
R Part number after rework.
S Superseding or equivalent part number.
X Reworked part and superseding part are functionally and physically
equivalent but not identical.

### Page 9

S E R V I C E B U L L E T I N 8 --- 2 4 --- 8 4
S . B . 8 --- 2 4 --- 8 4
Page 6 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
3. ACCOMPLISHMENT INSTRUCTIONS
A . J o b S e t --- U p
(1) Either pull and clip circuit breakers required to isolate affected circuits or placard
and select aircraft electrical power to OFF . Obey all relevant WARNINGS and
C A U T I O N S d e t a i l e d i n M a i n t e n a n c e M a n u a l P S M 1 --- 8 --- 2 o r P S M 1 --- 8 2 --- 2 o r
P S M 1 --- 8 3 --- 2 .
(2) Refer to Figure 1 and gain access to the flight compartment. Locate the #1 GCU
on the bottom shelf of the right DC circuit breaker console.
B. Procedure
P a r t 1 --- G C U R e p l a c e m e n t
( 1 ) R e f e r t o P S M 1 --- 8 --- 2 C h a p t e r 2 4 --- 3 1 --- 0 3 o r P S M 1 --- 8 3 --- 2 C h a p t e r 2 4 --- 3 1 --- 0 3
o r P S M 1 --- 8 2 --- 2 T A S K 2 4 --- 3 1 --- 1 6 --- 0 0 0 --- 8 0 1 a n d F i g u r e 2 a n d r e m o v e e x i s t i n g
#1 GCU part number GC- - -1010- - -24- - -5DII or GC- - -1010- - -24- - -5III from the
bottom shelf of the right DC circuit breaker console.
(2) Refer to enclosed Phoenix Aerospace Inc. Service Bulletin #: 000331- - -1 and
P S M 1 --- 8 --- 2 C h a p t e r 2 4 --- 3 1 --- 0 3 o r P S M 1 --- 8 3 --- 2 C h a p t e r 2 4 --- 3 1 --- 0 3 o r P S M
1 --- 8 2 --- 2 T A S K 2 4 --- 3 1 --- 1 6 --- 4 0 0 --- 8 0 1 a n d F i g u r e 2 a n d i n s t a l l n e w G C U p a r t
number GC- - -1010- - -24- - -5DV to bottom shelf of the right DC circuit breaker
console.
Part 2 - - - Label Installation
( 1 ) R e f e r t o P S M 1 --- 8 --- 2 C h a p t e r 2 0 --- 2 2 --- 0 2 o r P S M 1 --- 8 3 --- 2 C h a p t e r 2 0 --- 2 2 --- 0 2
o r P S M 1 --- 8 2 --- 2 T A S K 2 0 --- 2 2 --- 0 2 --- 4 0 0 --- 8 0 1 a n d F i g u r e 3 a n d r e m o v e a n d
replace existing electrical connector label 2431- - -GCU1 with new warning label
81151169- - -101.
(2) If the operator chooses to have the label made locally, do the steps that follow.
( a ) R e f e r t o F i g u r e 4 a n d P S M 1 --- 8 --- 2 C h a p t e r 2 0 --- 2 2 --- 0 6 o r P S M 1 --- 8 3 --- 2
C h a p t e r 2 0 --- 2 2 --- 0 6 o r P S M 1 --- 8 2 --- 2 T A S K 2 0 --- 0 0 --- 1 1 --- 8 0 0 --- 8 0 1 a n d
make the label.
(b) Identify label as 8DK4141- - -101.
( c ) R e f e r t o P S M 1 --- 8 --- 2 C h a p t e r 2 0 --- 2 2 --- 0 2 o r P S M 1 --- 8 3 --- 2 C h a p t e r
2 0 --- 2 2 --- 0 2 o r P S M 1 --- 8 2 --- 2 T A S K 2 0 --- 2 2 --- 0 2 --- 4 0 0 --- 8 0 1 a n d F i g u r e 3 a n d
remove and replace existing electrical connector label 2431- - -GCU1 with
new warning label 8DK4141- - -101.
C. Close Out
(1) Remove all tools and equipment from the work area.

### Page 10

S E R V I C E B U L L E T I N 8 --- 2 4 --- 8 4
S . B . 8 --- 2 4 --- 8 4
Page 7 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
( 2 ) R e f e r t o P S M 1 --- 8 --- 2 C h a p t e r 2 4 --- 3 1 --- 0 0 o r P S M 1 --- 8 3 --- 2 C h a p t e r 2 4 --- 3 1 --- 0 0
and do an operational test of the DC Generator System or PSM 1- - -82- - -2 TASK
24- - -31- - -00- - -720- - -801 and do a functional test of the DC Generator System.
(3) On incorporation of this ModSum, make an entry that conforms to local
regulatory requirements in the applicable logbook(s). Enter component serial
numbers if applicable. Enter this ModSum number only after complete and
functional incorporation of all work defined in this service bulletin.

### Page 11

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S . B . 8 --- 2 4 --- 8 4
Page 8 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
#1 GCU Location
Figure 1
GENERATOR CONTROL UNIT
GC- - -1010- - -24- - -5DV
QTY: 1
LABEL
81151169- - -101
or
8DK4141- - -101
QTY; 1

### Page 12 (OCR)

SERVICE BULLETIN 8-24-84
LEGEND
1. DC generator control
unit (GCU).
2. Connector.
3. Screw.
4. Tray (shelf).
dam01_2431032_001.dg, qw, 30/09/05
Removal/Installation of Generator Control Unit
Figure 2
22 Aug 2008  S.B. 8-24-84
Revision 'D' 10 Apr 2014  Page 9 of 18
MG

### Page 13

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S . B . 8 --- 2 4 --- 8 4
Page 10 of 18
22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
Label Location
Figure 3
WARNING LABEL
81151169- - -101
or
8DK4141- - -101

### Page 14 (OCR)

SERVICE BULLETIN 8-24-84
WARNING*  10\
9
FOR 2431-GCU1, INSTALL ONLY P/N*
GC-1010-24-5DIV OR GC-1010-24-5DV.
L 8DK4141-101
(4.50)
FONT TO BE UNIVERSE 67 CONDENSED BOLD AT 24 PT, COLOR TO BE
10\  RUBY RED FOIL DSC 465-09.
FONT TO BE UNIVERSE 67 CONDENSED BOLD AT 19 PT, COLOR TO BE
RUBY RED FOIL DSC 465-09.
SYMBOL COLOR TO BE
8  RUBY RED FOIL DSC 465-09.
LABEL PART NUMBER IS TO BE PRINTED IN THE BOTTOM LH CORNER.
FONT TO BE ARIAL BLACK AT 7 PT., COLOR TO BE
RUBY RED FOIL DSC 465-09.
SUBSTRATE BACKGROUND COLOR TO BE
WHITE VINYL FILM DSC 85-7A.
5. MAX SIZE 4.50 (LENGTH) × 1.13 (HEIGHT).
4. THIS LABEL TO BE BORDERLESS WITH . 12R CORNERS.
3. LABEL MATERIALS (CONSTRUCTION BOTTOM TO TOP):
-COLOR FOILS PER DSC 465-XX.
-CLEAR OVERLAMINATE MATTE POLYESTER FILM WITH ADHESIVE BACKING PER
DSC 85-4A.
2. ENGINEERING APPROVAL REQ'D ON FIRST ARTICLE PRIOR TO PRODUCTION RUN.
1. LABELS PRODUCED BY GERBER THERMAL PRINT PROCESS PER P.P.S. 22.12.
ANDRO. CONTE PANAL NALA TON BY HE HE EVANT ARRANES AUTHORITAY DE LAN AND TO AND UMBARD ER NO.
INCORPORATION AND INSTALLATION.
Warning Label 8DK4141-101
Figure 4
22 Aug 2008  S.B. 8-24-84
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### Page 15 (OCR)

SERVICE BULLETIN 8-24-84
SERVICE BULLETIN
FOR
DC POWER GENERATION
GENERATOR CONTROL UNIT
GC-1010-24-5D III AND GC-1010-24-5D IV
NEW UNIT AVAILABILITY
PAGE 1 OF 6
DATE: AUG 29/08  SERVICE BULLETIN #: 000331-1
22 Aug 2008  S.B. 8-24-84
Revision 'D' 10 Apr 2014  Page 12 of 18
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### Page 16 (OCR)

SERVICE BULLETIN 8-24-84
INTRODUCTION
This Service Bulletin has been prepared in conformance with A.T.A. Specification
No. 100 for Manufacturer's Technical Data. The information contained herein
describes the replacement of the Phoenix Aerospace Inc. Model GC-1010-24-5D III
or GC-1010-24-5D IV DC GCUs with the Phoenix Aerospace Inc. Model GC-1010-
24-5D V DC GCUS. With the changing of the GCUs, Undervoltage Protection and
an External, Regulated Voltage Adjustment Pot have been added to the DC
Generator Control Unit capability. There are no changes in fit and form from the
Phoenix Aerospace Inc. Model GC-1010-24-5D III or GC-1010-24-5D IV previously
installed. There is no weight difference and all functions are unchanged with the
exception of the additional Undervoltage Protection and External, Regulated
Voltage Adjustment capability. The Phoenix Aerospace Inc. Model GC-1010-24-5D
V DC GCU installs directly into the present mounting location utilizing the mounting
hardware used for the existing DC GCU with no modifications to airframe or aircraft
PAGE 2 OF 6
DATE: AUG 29/08  SERVICE BULLETIN #: 000331-1
22 Aug 2008  S.B. 8-24-84
Revision 'D' 10 Apr 2014  Page 13 of 18
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### Page 17 (OCR)

SERVICE BULLETIN 8-24-84
PLANNING INFORMATION
1. EFFECTIVITY.
This Service Bulletin is applicable to all Bombardier, de Havilland DASH 8 Series
100, 200, and 300 Aircraft presently equipped with the Phoenix Aerospace Inc.'s
Model GC-1010-24-5D III or GC-1010-24-5D IV Generator Control Units and to
Generator Control Units held as spares.
2. REASON.
The GC-1010-24-5D V Generator Control Unit incorporates circuitry for
UNDERVOLTAGE Protection in accordance with de Havilland EPS 8/3-1 Issue
C. An externally accessible, Regulated Voltage Adjustment Pot is mounted on
the front of the Generator Control Unit. The GC-1010-24-5D V shares a
common fit and form with the present Phoenix Aerospace Inc. Model GC-1010-
24-5D III and GC-1010-24-5D IV GCU.
A regulated DC Generator voltage of 20.5 ‡ 0.5 VDC will be detected as an
UNDERVOLTAGE Fault, if this condition is not associated with Engine Starting,
Generator Current Limiting, or Generator Overcurrent operation. If the detected
UNDERVOLTAGE Fault condition is sustained for 9 1 1.0 second, the GCU
Field Relay will TRIP and remove excitation from the Generator Field as well as
open the DC Bus Contactor. Present DC Bus Tie Logic is maintained by the
Phoenix Aerospace Inc. Model BP-1010-24-8E Bus Bar Protection Unit being
utilized in the aircraft DC system.
Also if the DC Bus Contactor does not close due to a Differential Voltage Fault
which is also detected as an UNDERVOLTAGE Fault, the GCU will TRIP its
Field Relay after 9 + 1.0 second to remove the related Generator from the
system. This will allow the Bus Bar Protection Unit, with information from the
Aircraft's Left and Right Generator Logic Relays, to apply Bus Tie logic to the
DC system.
PAGE 3 OF 6
DATE: AUG 29/08  SERVICE BULLETIN #: 000331-1
22 Aug 2008  S.B. 8-24-84
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### Page 18 (OCR)

SERVICE BULLETIN 8-24-84
3. DESCRIPTION.
This Service Bulletin describes the replacement of any existing PAI Model GC-
1010-24-5D III or GC-1010-24-5D IV GCU with the PAI Model GC-1010-24-5D
V GCU for the purpose of extending DC system fault protection and versatility.
The GCUs can be replaced at aircraft overhaul or at any other time the
maintenance routine permits.
4. APPROVAL.
This Service Bulletin authorizes the replacement of Phoenix Aerospace Inc
Model GC-1010-24-5D III or GC-1010-24-5D IV GCUs with Phoenix Aerospace
Inc. Model GC-1010-24-5D V GCUS. This manufacturer's guideline is based on
the compatibility of both types of GCUs with all Bombardier, de Havilland DASH
8 Series 100, 200, and 300 Aircraft.
Before any Phoenix Aerospace Inc. Model GC-1010-24-5D III or GC-1010-24-
5D IV GCUs are replaced with Phoenix Aerospace Inc. Model GC-1010-24-5D V
GCUs, further approvals may be required. It is the responsibility of any facility
making such an exchange to determine if approval of the aircraft owner, aircraft
5. MANPOWER.
The man-hours required to accomplish the tasks called out in this Service
Bulletin are minimal. They can best be determined by reviewing the installing
facilities aircraft maintenance and operating procedure for removing and
installing Generator Control Units.
6. MATERIAL - COST AND AVAILABILITY.
There are no special tools or equipment required to accomplish the required
tasks.
Phoenix Aerospace Inc. Model GC-1010-24-5D V DC GCUs may be obtained
from Phoenix Aerospace Inc., Kansas City, MO. For new equipment, contact
the factory direct for current price and delivery.
PAGE 4 OF 6
DATE: AUG 29/08  SERVICE BULLETIN #: 000331-1
22 Aug 2008  S.B. 8-24-84
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### Page 19 (OCR)

SERVICE BULLETIN 8-24-84
6. MATERIAL - COST AND AVAILABILITY. (Cont)
As of the date of this Service Bulletin, any Phoenix Aerospace Inc. Model GC-
1010-24-5D III or GC-1010-24-5D I GCU may be returned to Phoenix
Aerospace Inc., Kansas City, MO for reconfiguring to a Model GC-1010-24-5D V
GCU. The cost for reconfiguring a GC-1010-24-5D III to GC-1010-24-5D V is
$1380. USD through calendar year 2009. The cost to reconfigure the GC-1010-
24-5D IV to the GC-1010-24-5D V is $760. USD through calendar year 2009.
Please note that it will be a minimum of 90 days before a unit can be included in
the production schedule for upgrading.
Factory Address:
Phoenix Aerospace Inc.
220 West 80th Terrace
P. O. Box 8744
Kansas City, MO 64114-0744
Factory Phone Number: (816) 333-3400
Factory Fax Number: (816) 444-4133
E-Mail Address: sales@phoenixaerospace.com
7. WEIGHT AND BALANCE.
Weight and Balance not affected.
8. ELECTRICAL LOAD DATA.
The herein described change will have no effect on the electrical load
requirements of the GCU or the Aircraft's DC Electrical System.
9. PUBLICATIONS AFFECTED.
It is the responsibility of the agency making the exchange to determine if there
are changes to the Aircraft Maintenance Manual by checking with the aircraft
manufacturer.
PAGE 5 OF 6
DATE: AUG 29/08  SERVICE BULLETIN #: 000331-1
22 Aug 2008  S.B. 8-24-84
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### Page 20 (OCR)

SERVICE BULLETIN 8-24-84
9. PUBLICATIONS AFFECTED. (Cont)
For the Phoenix Aerospace Inc. GC-1010-24-5D V GCU Maintenance and
Overhaul Manuals, P.N. 104605 and 105605 respectively, are available from
Phoenix Aerospace Inc. Kansas City, MO for $500. USD each.
ACCOMPLISHMENT INSTRUCTIONS
1. GENERAL.
The Phoenix Aerospace Inc. Model GC-1010-24-5D V DC GCU installs directly
into the GC-1010-24-5D III or GC-1010-24-5D IV mounting location. The
mounting hardware used for the existing DC GCU may be utilized with no
modifications to aircraft airframe or wiring. Reference may be made to the
Aircraft Maintenance Manual (obtained from the Aircraft Manufacturer) to assist
in determining the mechanical tasks involved. There are no changes in the
overall operation of the DC Electrical System. Information specific to the GCUs
may be obtained by referencing their current maintenance and overhaul
manuals.
2. REQUIRED MATERIALS.
New equipment consists of Phoenix Aerospace Inc. Model GC-1010-24-5D V
DC GCUs, Control Number 095705, two per aircraft, three if the aircraft is
equipped with an APU.
Existing equipment consists of Phoenix Aerospace Inc. Model GC -1010-24-5D
III DC GCUs, Control Number 095505, two per aircraft, three if the aircraft is
equipped with an APU.
Existing equipment may consist of one Phoenix Aerospace Inc. Model GC-1010-
24-5D IV DC GCU, Control Number 095605, in the left engine position; two
Model GC-1010-24-5D III DC GCUs, Control Number 095505, one in the right
engine position and one in the APU position, if so equipped.
PAGE 6 OF 6
DATE: AUG 29/08  SERVICE BULLETIN #: 000331-1
22 Aug 2008  S.B. 8-24-84
Revision 'D' 10 Apr 2014  Page 17 of 18
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22 Aug 2008
MGRevision ‘D’ 10 Apr 2014
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