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T x L t r S B 8 4 --- 3 2 --- 1 4 3 Page 1 of 2 Revision ‘B’ 16 Nov 2016 LS 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 4 --- 3 2 --- 1 4 3 Landing Gear - - - MLG Solenoid Sequence Valve Latch And Retract Software Logic Changes - - - ModSum 4- - - 126659 This page transmits Revision ‘B’ of Service Bulletin 84- - -32- - -143, pages 1 thru 14, dated 16 Nov 2016.
This service bulletin is re- - -issued in its entirety for the reasons that follow:
--- s e c t i o n1. PLANNING INFORMATION para D. Compliance is revised to include the TC AD number CF- - -2016- - -31 --- s e c t i o n1. PLANNING INFORMATION para L. References is revised to convey the latest revision of the service bulletin, re lated engineering documentation and TC AD number CF- - -2016- - -31 --- s e c t i o n2. MATERIAL INFORMATION para A. Parts Required Per Aircraft is revised t oa d dN O T E3&4 and to include additional info to existing NOTE 2 --- s e c t i o n3. ACCOMPLISHMENT INSTRUCTIONS para B., revised the NOTE after step (6) (a) to included additional information, and added new step (10)
- - - the initial issue of the merged UTC Aerospace Systems Service Bulletin VSB 30145- - -32- - -131 is replaced with the R1 version of the VSB dated Nov 4/16.
The Compliance in the previous issue of this service bulletin is not affected by this revision. No additional rework to the aircraft is introduced by this revision.
Remove revision ‘A’ of Service Bulletin 84- - -32- - -143 and merged VSB, and replace with this revised service bulletin and merged VSB.
Previous issue(s) of Service Bulletin 84- - -32- - -143:
Initial issue - - - Pages 1 thru 14 dated 30 Jun 2016 Revision ‘A’ - - - Pages 1 thru 12 dated 05 Aug 2016
T x L t r S B 8 4 --- 3 2 --- 1 4 3 Page 2 of 2 Revision ‘B’ 16 Nov 2016 LS This Page Intentionally Blank 1
D S.B. 84- - -32- - -143 Page 1 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016
SERVICE BULLETIN Customer Support ATA SYSTEM: 3261 NUMBER: 84- - -32- - -143
BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS
SERVICE BULLETIN TO BE PARTICULARL Y SIGNIFICANT AND
URGE OPERATORS TO PROMPTL Y EVALUATE THE CONTENTS SUBJECT : Landing Gear - - - MLG Solenoid Sequence Valve Latch And Retract Software Logic Changes - - - ModSum 4- - - 126659
1. PLANNING INFORMA TION A. Effectivity Aircraft Affected:
In- - -Service: DHC- - -8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003 thru 4534.
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 2 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 Pre - - - Requisite ModSum Title 4Q126420 Production - - - Landing Gear - - - Proximity Sensor System PSEU Logic Update - - - Introduction of P/N 30145- - -0401 or 4Q126432 Retrofit - - - Landing Gear - - - Proximity Sensor System PSEU Logic Update - - - Introduction of P/N 30145- - -0401 (SB 84- - -32- - -66) Related ModSum Title 4Q126651 L a n d i n g G e a r --- P r o x i m i t y S e n s o r s --- P S E U --- Introduction of PSEU 30145- - -0601 4Y124247 Landing Gear - - - MLG SSV Latch And Retract Software Logic Changes 4Y124239 Landing Gear - - - MLG SSV Latch And Retract Software Logic Changes Production: Not Applicable NOTE: The instructions in this service bulletin are only applicable to the systems and parts installed at the time of delivery on the aircraft or as changed by Bombardier Aerospace Service Bulletin(s). Before you do this bulletin, examine all STC or equivalent action changes to make sure this bulletin can be completed.
Spares Affected:
The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts. See Paragraph 2.D., Existing Parts Accountability, for disposition.
Part Number Description 30145- - -0201/- - -0301/- - -0401 and - - -0501 PSEU
S.B. 84- - -32- - -143 Page 3 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 B. Reason Problem: Existing PSEU software can permit inadvertent de- - -pressurization of the MLG stabilizer brace unlock actuator under excessive vibration conditions, and also could permit landing gear re traction without all gears being w e i g h t --- o f f --- w h e e l s .
Solution: This service bulletin introduces ModSum 4- - -126659.
The ModSum replaces existing PSEU 30145- - -0201/- - -0301/- - -0401 and
- - -0501 with replacement PSEU 30145- - -0601.
PSEU 30145- - -0601 has new software that includes new logic equations to latch power to the solenoid sequence valve (SSV), preventing de- - -pressurization of the MLG stabilizer brace unlock actuator under excessive vibration conditions. This new PSEU also includes revised retraction logic that requires all gears to be weight- - -off- - -wheels before permitting the landing gear to retract.
C. Description The procedures in this service bulletin give the instructions to do the tasks that follow:
- - - aircraft electrical power is removed
- - - each main landing gear is secured with lock pins installed thru each main gear and main gear door mechanism
- - - the nose landing gear lock is engaged
- - - the existing PSEU P/N 30145- - -0201/- - -0301/- - -0401 or - - -0501 is removed
- - - the polarization keying of existing PSEU connector 3261- - -P1A/B/C is reworked
- - - reworked connector 3261- - -P1A/B/C is reidentified as 8MK4787- - -001
- - - replacement PSEU P/N 30145- - -0601 is installed and tested
- - - close out.
D. Compliance Bombardier Inc. highly recommend that ModSum 4- - -126659 be incorporated at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority.
Transport Canada Airworthiness Directive CF- - -2016- - -31.
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 4 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 E. Approval The technical content of this service bulletin has been approved under the authority of the Transport Canada Civil Aviation (TCCA) Design Approval Organization No: DAO # 9 3 --- Q --- 0 2 .
This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage T olerance Inspections (DTIs).
F. M a n p o w e r It will take an estimated 6 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 0.25 Procedure 1.50 T e s t/R T S 4.00 Close- - -Out 0.25 This estimate is for direct labour done by an experienced crew and it does not include, planning, familiarization, cure tim e, part fabrication, tool acquisition or lost time.
G. Material - - - Price and Availability Refer to merged UTC Aerospace Systems Service Bulletin 30145- - -32- - -131.
H. T ooling - - - Price and Availability None I. Weight and Balance Not affected
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 5 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 J. Electrical Load Data Not affected K. Publications Affected Aircraft Illustrated Parts Catalogue PSM 1- - -84- - -4....................
ModSums Manual PSM 1- - -84- - -12..................................
L. References Revision ‘B’ of this service bulletin was prepared to the engineering drawings and related data that follows:
DRAWING SHEET REV 8MK4787 1 --- A ModSum 4- - -126659 Rev. - - -E ModSum 4Q126659 Rev. - - -D PCA 46031 Rev. 0 (for internal reference only) Transport Canada Airworthiness Directive CF- - -2016- - -31 UTC Aerospace Systems Service Bulletin 30145- - -32- - -131 R1 dated Nov 4/16
2. MATERIAL INFORMA TION A. Parts Required Per Aircraft
(1) Modification Kit 8MK4787- - -001.
(2) Detailed Kit Content:
Quantity Per Kit --- 0 0 1 Part Number Description Remarks 1 30145- - -0601 PSEU see Note 2 below
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 6 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 NOTE 1: This service bulletin is self- - -contained (illustrated). No drawings will be supplied.
NOTE 2: This item is required to install the kit. This item is not included in the kit and must be procured by the customer.
Due to component availability, operators may receive a P/N 30145- - - 0601 PSEU or a P/N 30145- - - 0602 PSEU.
If in receipt of a P/N 30145- - - 0601 PSEU, declare this BA SB and merged UTC Aerospace Systems VSB 30145- - - 32- - - 131.
If in receipt of a P/N 30145- - - 0602 PSEU, declare BA Service B u l l e t i n 8 4 --- 3 2 --- 1 4 9 a n d m e r g e d V S B U T C A e r o s p a c e S y s t e m s Service Bulletin 30145- - - 32- - - 134.
NOTE 3: PSEU part number (P/N) 30145- - -0601 is two way interchangeable with p/n 30145- - -0602 NOTE 4: PSEU part number (P/N) 30145- - -0601 is one way interchangeable with p/n 30145- - -0501 / - - -0401 / - - -0301 & - - -0201.
Listed drawings that are required to complete the kits above can be requested by writing to the following e- - -mail address:
qseriesdwgrequest@aero.bombardier.com B. Parts Required to Modify Spares None C. Special T ools and Equipment Required None
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 7 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 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 per next higher assembly for indented parts.
Existing Part Number Description Qty. IC DC New Part Number PNC 30145- - -0201 PSEU 1 C SAL 30145- - -0601 S 30145- - -0301 PSEU 1 C SAL 30145- - -0601 S 30145- - -0401 PSEU 1 C SAL 30145- - -0601 S 30145- - -0501 PSEU 1 C SAL 30145- - -0601 S IC Interchangeability Code A Not interchangeable.
B Removed Part. No direct replacement.
C Interchangeable one way only.
DC Disposition DIS Discard Part.
MUI Multiple Usage Item: Return to stock if serviceable.
RWK Rework existing part in accordance with this service bulletin.
RWI Rework existing part per .....
SAL Salvage. Return to operator’s stores or Goodrich.
PNC Part Number Code N No equivalent Bombardier Inc. part number for reworked part. Indicate on part that this service bulletin has been accomplished.
R Part number after rework.
S Superseding part number.
X Reworked part and superseding part are functionally and physically equivalent but not identical.
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 8 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016
3. ACCOMPLISHMENT INSTRUCTIONS If it is not possible to complete all the instructions of this service bulletin because of the configuration of the aircraft, speak with a representative of Bombardier in the CRC at 1- - -844- - -272- - -2720 (1- - -844- - -CRC- - -CRCO) or email at thd.qseries@aero.bombardier.com for analysis and to get an approved disposition to complete this service bulletin.
A . J o b S e t --- U p NOTE: Make sure to put a protective cover on any disconnected electrical connector.
(1) Placard and select all aircraft electrical power to OFF . Obey all relevant W A R N I N G S a n d C A U T I O N S ( r e f e r t o A M M T A S K ’ S 2 4 --- 0 0 --- 0 0 --- 8 6 1 --- 8 0 2 a n d 24- - -00- - -00- - -910- - -801).
(2) Make sure that lock pins are installed through each main gear and main gear door mechanism.
(3) Make sure the nose gear ground lock is engaged.
(4) Set wheel chocks in front and behind the landing gear tires.
(5) Remove the front panel from the avionics rack.
B. Procedure
(1) Locate the existing PSEU P/N 30145- - -0201/- - -0301/- - -0401 or - - -0501 (refer to Figure 1).
(2) Remove the existing PSEU P/N 30145- - -0201/- - -0301/- - -0401 or - - -0501 (refer to PSM 1- - -84- - -2 (AMM) TASK 32- - -61- - -01- - -000- - -801).
(3) Rework the polarization keying of existing PSEU connector 3261- - -P1A/B/C as follows:
(a) Gain access to the front of PSEU connector 3261- - -P1A/B/C on the mounting tray (refer to Figure 2 VIEW A for connector location).
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 9 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016
(b) Change the existing polarization posts positions as shown in Figure 2 VIEW B to agree with applicable instructions given in PSM 1- - -84- - -2W Wiring Diagram Manual (WDM) Chapter 20- - -17- - -51- - -401.
(c) Reidentify reworked connector as 8MK4787- - -001 to agree with applicable instructions given in AMM TASK 20- - -00- - -01- - -910- - -802.
(4) Adjust the following proximity sensors to the new gaps given below as follows:
CAUTION: USE CAUTION NEAR THE FACE OF THE PROXIMITY SENSOR
BECAUSE YOU CAN CAUSE DAMAGE TO THE PROXIMITY SENSOR.
(a) Remove and discard the lockwire from the jam nuts.
(b) Adjust the sensors to their nominal clearances, refer to T ables 1 & 2 that follow:
(5) Install PSEU P/N 30145- - -0601 (refer to applicable instructions in AMM TASK 32- - -61- - -01- - -400- - -801).
(6) Do an Inductance Value Check of the following proximity sensors:
(a) At the PSEU, use the SYSTEM STATUS MENU to make sure the inductance in each sensor is Nominal Near.
NOTE: Adjust the sensors, as necessary, to get the permitted tolerances.
Make sure the right gear uplock and left gear uplock are disengaged (uplock sensors indicating “FAR”) while right and/or left downlock sensors (RGDLK1, RGDLK2, LGDLK1, LGDLK2) are adjusted.
S E R V I C E B U L L E T I N 8 4 --- 3 2 --- 1 4 3 S.B. 84- - -32- - -143 Page 10 of 14 30 Jun 2016 LS Revision ‘B’ 16 Nov 2016 TABLE 1 Sensor Name (Abbreviation) Near Gap Nominal (inches) Near Gap To l e r a n c e ( i n c h e s ) Left Gear Downlock #1 (LGDLK1) 0.045 +0.005/- - -0.005 Left Gear Downlock #2 (LGDLK2) 0.045 +0.005/- - -0.005 Nose Gear Down #1 (NGDN1) 0.050 +0.005/- - -0.015 Nose Gear Down #2 (NGDN2) 0.050 +0.005/- - -0.015 Nose Gear Lock #1 (NGLK1) 0.050 +0.005/- - -0.005 Nose Gear Lock #2 (NGLK2) 0.050 +0.005/- - -0.005 Right Gear Downlock #1 (RGDLK1) 0.045 +0.005/- - -0.005 Right Gear Downlock #2 (RGDLK2) 0.045 +0.005/- - -0.005 TABLE 2 Inductance Check Sensor Name (Abbreviation) Near Gap To o C l o s e mH Nominal Near mH Near Gap T oo Large mH Left Gear Downlock #1 (LGDLK1) 8.523 8.355 8.232 Left Gear Downlock #2 (LGDLK2) 8.523 8.355 8.232 Nose Gear Down #1 (NGDN1) 8.520 8.256 8.072 Nose Gear Down #2 (NGDN2) 8.520 8.256 8.072 Nose Gear Lock #1 (NGLK1) 8.438 8.302 8.196 Nose Gear Lock #2 (NGLK2) 8.438 8.302 8.196 Right Gear Downlock #1 (RGDLK1) 8.523 8.355 8.232 Right Gear Downlock #2 (RGDLK2) 8.523 8.355 8.232