SERVICE BULLETIN No. 1026
Piper PA-39 Twin Comanche C/R · Service Bulletins
Overview
This Service Bulletin No. 1026, dated November 5, 1998, addresses a critical issue regarding the flexible coupling connecting the vacuum pump in several Piper aircraft models, including the PA-39 Twin Comanche. The bulletin mandates compliance for affected aircraft to prevent potential vacuum pump failures that could lead to loss of vacuum pressure and instrument functionality. It includes detailed instructions for inspection and replacement of the flexible couplings as outlined in Parker Hannifin Airborne Service Letter 48. Compliance is required prior to the next flight in IFR conditions or within ten hours of flight time, whichever comes first. The bulletin emphasizes the importance of checking the applicability of the service letter before proceeding with any maintenance actions.
- Compliance is mandatory prior to next IFR flight or within 10 hours of flight time.
- Inspect and replace vacuum pump flexible couplings as per Parker Hannifin Airborne Service Letter 48.
- Access to the engine is required to inspect the vacuum pump.
- Use Piper Part Number 753-910 for the coupling kit as needed.
- Document compliance in the airframe logbook after completing the instructions.
Document
Source
Originally published by www.univair.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 1998
- Pages
- 7
- File size
- 432 KB
- Publisher
- www.univair.com
Common. Rarer than 10% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Piper PA-39 Twin Comanche C/R.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
Free — save the PA-39 Twin Comanche C/R to your watchlist and track it in one place.
More Piper PA-39 Twin Comanche C/Rmanuals & documents
See all 21 →- SERVICE BULLETIN NO. 1160AService Bulletins
- AAIB Bulletin: 2/2018Service Bulletins
- AAIB Bulletin: 2/2018Other Documents
- EL-82 1 February 2017Supplemental Type Certificate
- Eligibility ListSupplemental Type Certificate
- Type Acceptance ReportOther Documents
- Piper Twin Comanche Service ManualWeight And Balance
- Piper Twin Comanche Service ManualPilot's Operating Handbook
- SERVICE SPARES LETTER NO. 406Service Bulletins
- PIPER PA-30 AND PA-39 TWIN COMANCHE PARTS CATALOGV Speeds Reference
- PIPER TWIN COMANCHE SERVICE MANUALWiring Diagram
- Service Letter No. 850Weight And Balance
In this document
Purpose
The purpose of this Service Bulletin is to inform owners and operators of the PA-39 Twin Comanche and other affected models about a potential failure of the flexible coupling connecting the vacuum pump. This failure could lead to a loss of vacuum pressure, affecting critical instruments and systems. The bulletin mandates compliance with Parker Hannifin Airborne Service Letter 48 for inspection and replacement of the couplings.
Compliance Time
Compliance with the instructions in this Service Bulletin is mandatory prior to the next flight in IFR conditions. If not operating under IFR, compliance must be completed within ten flight hours or sixty days, whichever occurs first.
Instructions
The bulletin provides step-by-step instructions for inspecting and replacing the vacuum pump flexible couplings. It emphasizes the need to read Parker Hannifin Airborne Service Letter 48 before starting the procedure. Key steps include gaining access to the engine, removing the vacuum pump, inspecting the coupling, and installing the new coupling kit (Piper Part Number 753-910) as necessary.
Material Required
The materials required for compliance include one or two coupling kits and possibly a new vacuum pump, depending on the inspection results. The specific part number for the coupling kit is 753-910.
Availability of Parts
Parts required for compliance with this Service Bulletin can be obtained from Piper Field Service Facilities. It is recommended to contact the facility for arrangements.
Safety notes
- Failure to comply with this Service Bulletin may result in loss of vacuum pressure and instrument functionality.
- Inspect all vacuum pump assemblies on affected aircraft, as some may not have vacuum systems installed.
Full document text
r.· .iA.. 'r-'lper The New Piper Aircraft, Inc. 2926 Piper Drive Vera Beach, Florida, U.S.A. 32960 SUBJECT: MODELS AFFECTED: PA~IB/18-~ 50 Supe~ Cub PA-18-150 Super Cub PA-22-1 08 Colt PA-23-250 Aztec PA-24-180/250 Comanche PA-24-260 Comanche PA-24-400 Comanche PA-28-140 Cherokee PA-28-150/160/180 Cherokee PA-28-151 Warrior PA-28-161 Warrior II PA-28-161 Cadet PA-28-161Warrior Ill PA-28-181 Archer II PA-28-181 Archer Ill PA-28-235 Cherokee PA-28-236 Dakota PA-28-201T Turbo Dakota PA-28R-180 Arrow PA-28R-200 Arrow/Arrow II PA-28R-201 Arrow Ill PA-28R-201 Arrow PA-28R-201T Turbo Arrow Ill PA-28R-201T Turbo Arrow PA-28RT -201 Arrow IV PA-28RT-201T Turbo Arrow IV SERVICE BULLETIN No. 1026 Ill DATE: PIPER CONSIDERS COMPLIANCE MANDATORY November 5, 1998 ( S/M) ~I Distribution of Parker Hannifin Airborne Service Letter 48, "Inspection/Replacement of dry air pump flexible couplings". SERIAL NUMBERS AFFECTED: 18-8020 through 18-9004 18- 7309016 through 18-8309025 1809001 through 1809113 22-8000 through 22-9848 27-549 through 27-4866 27-7304917 through 27-8154030 24-2176 through 24-3687 24-3642, 24-4000 through 24-5028 26-2 through 26-148 28-20000 through 28-7725290 28-1 through 28-7505259 & 28-E13 28-7415001 through 28-7715314 28-7716002 through 28-8616057 2816001 through 2816119 2841001 through 2841365 2842001 through 2842036 28-7690001 through 28-8690056 2890001 through 2890205 2890206 through 2890231 2843001 through 2843129 2843131 through 2843184 28-10001 through 28-7710089 & 28-E11 28-7911001 through 28-8611008 2811001 through 2811050 28-7921001 through 28-7921091 28R-30001 through 28R-7130013 28R-35001 through 28R-7635462 28R-7737001 through 28R-7837319 2837001 through 2837061 2844001 through 2844013 28R-7703001 through 28R-7803374 2803001 through 2803012 28R-7918001 through 28R-8218026 28R-7931001 through 28R-8631005 2831001 through 2831038 (OVER) ATA: 3711 PAGE 2 OF 3 MODELS AFFECTED: (Cont'd) PA-30-Twin Comanche PA-31/300/325 Navajo/Navajo CR PA-31-350 Chieftain PA-31-350 T1 020 PA-32-260 Cherokee Six PA-32-300 Cherokee Six PA-32-301 Saratoga PA-32RT-300T Turbo Lance II PA-32R-300 Lance PA-32RT-300 Lance II PA-32R-301 Saratoga SP PA-32R-301 Saratoga II HP PA-32R-301T Turbo Saratoga SP PA-32R-301T Saratoga II TC PA-34-200 Seneca PA-34-200T Seneca II PA-34-220T Seneca Ill (28V) PA-34-220T Seneca Ill PA-34-220T Seneca IV PA-38-112 Tomahawk PA-39-Twin Comanche PA-44-180 Seminole PA-44-180T Seminole COMPLIANCE TIME: APPROVAL: SERVICE BULLETIN NO. 1026 SERIAL NUMBERS AFFECTED: (Cont'd) 30-1 through 30-2000 31-2 through 31-861 31-7300901 through 31-8312019 31-5001 through 5004 31-7305005 through 31-8452021 31-8253001 through 31-8553002 32-1 through 32-7800008 32-40000 through 32-7940290 32-8006001 through 32-8606023 3206001 through 3206088 32R-7887001 through 32R-7987126 32R-7680001 through 32R-7880068 32R-7885001 through 32R-7985105 32R-8013001 through 32R-8613006 3213001 through 3213041 3213029, 3213042 through 3213103 3246001 through 3246120 32R-8029001 through 32R-8629006 3229001 through 3229003 3257001 through 3257063 34-7250001 through 34-7450220 34-7570001 through 34-8170092 3448001 through 3448035 34-8133001 through 34-8633031 3433001 through 3433170 3448038 through 3448079 3447001 through 3447029 38-78A0002 through 38-82A0124 39-1 through 39-155 44-7995001 through 44-8195026, 4495001 through 4495013, 4496001 through 4496020, 44-8107001 through 44-8207020 Prior to next flight in IFR conditions, but all flight operations not to exceed the ~ext ten (1 0) hours or sixty days time in service, whichever comes first. The technical contents of this Service Bulletin have been approved by the F.A.A. PURPOSE: We have been notified by Parker Hannifin Airborne that a condition exists where the flexible coupling connecting the vacuum pump may fail prematurely. As a result, Parker Hannilin Airborne has issued Service Letter 48 "Inspection/Replacement of dry air pump flexible couplings•, which is being distributed as part of this Service Bulletin. Left uncorrected, the vacuum pump may fail causing a loss of vacuum/pressure with the resultant loss of vacuum/pressure instruments and other appliances. This Service Bulletin provides for the distribution of Parker Hannifin Airborne Service Letter 48 "Inspection/Replacement of dry air pump flexible couplings" and requires the compliance with the instructions contained therein. SERVICE BULLETIN NO. 1026 PAGE 3 OF 3 INSTRUCTIONS: Note: Check Parker Hannifin Airborne Service Letter 48 carefully to assure applicability before removing vacuum pumps. (Check all pumps on all affected aircraft.) Vacuum pump assemblies may be affected due to the ir.stallalion of flexible coupling kits delivered by Piper or Airborne. Some aircrafl may not be equipped witr, vacuum systems as they were offered as optional equipment at the time of original manufacture. While listed in the Piper Service Bulletin as affected, some serial number aircrafl may not be affected due to optional equipment being installed at the factory or as an after factory modification (i.e. pneumatic deice system, etc.). 1. Read Parker Hannilin Airborne Service Letter 48 prior to starting these instructions. (The Parker Hannifin Airborne publication is included wHh this Service Bulletin, see Attachment "A".) 2. This service bulletin affects aircrafl which have defective vacuum pump flexible couplings installed as original equipment anc aircraft which may have vacuum pump flexible couplings installed as service spares. Check aircrafl applicability per the Model and Serial Number Affected section above. 3. Gatn access to tne eng1ne(S) oy removmg me cowlings as necessary to access the vacuum pump(s). 4. Remove the vacuum pump in accordance with the appropriate section or chapter of the applicable Service or Maintenance Manuals. Inspect pump prior to installing a new coupling lor condition and replace if required.
Show full textShow less
5. Comply fully with the instructions contained in Parker Hannifin Airborne Service Letter 48 by installing coupling kit, Piper Part number 7 53-91 0, as required. 6. Install a repaired or new vacuum oump as required by inspection and perform an engine run to verify proper operation of the vacuum system in accordance with the appropnate section or chapter of the applicable Serv.ce or Maintenance Manuals. 7. Upon compliance with the Parker Hannifin Airborne Service Letter 48 and completion of these instructions, make an appropriate airframe logbook entry of compliance with this Service Bulletin. MATERIAL REQUIRED: As required by inspection, one (1) or two (2) each, Coupling Kit, Vacuum Pump, Piper Part Number 753-910 as applicable, per aircraft. AVAILABILITY OF PARTS: Your Piper Field Service Facility. EFFECTIVITY DATE: This Service Bulletin is effective upon receipt. SUMMARY: Factory Participation is limited to New Aircraft in warranty and New Piper Parts in warranty. This participation will remain in effect for a period of time not to exceed 180 days from the date of this Service Bulletin. Please contact your Factory Piper Field Service Facility to make arrangements for compliance with this Service Bulletin in accordance with the compliance time indicated. NOTE: II you are no longer in possession of this aircrafl, please forward this information to the present owner/operator and notify the factory of address/ownership corrections. Changes should include aircraft model, serial number, current owner's name and address. Corrections/Changes should be directed to: The New Piper Aircraft, Inc. ATTN: Customer Services 2926 Piper Drive Vero Beach, FL 32960 ATTACHMENT "A" PIPER SERVICE BULLETIN NO. 1026 AirborneAir & Fuel Products ~~- Service Letter Number: 48 Date: 1Ql20/98 Service Letter Subject: Inspection/Replacement of dry air pump flexible couplings. Aoplicability: Airbor~e dry ai' pumps, conversion kits and flexible coupling kits with the followtng part numbers; serial numbers which have not been inspected per tnis servtce letter as identified in step number seven of the procedure listed below. These components were shipped from Airborne between 1/1/98 and 10/13198. Refer to Figure 1 tor location of part number/serial number nameplate. Item part Number (PIN) Serial Number (SIN) D0' Air Pump 211CC 2AP1 thru 10AP319 Dry Air Pump 211CC>S 1AP1 thru 2AP5 Dry Air Pump E211CC 11AN543 thru 11AN642 and 2AP1 thru 7 AP442 Dry Air Pump 212CW 2AP1 thru 7AP286 Dry Air Pump E212CVV 1AP1 thru 7AP492 Dry Air Pump 215CC 12AN719 thru 12AN940 and 1AP1 thru 9AP3510 Dry Air Pump 215CC-9 2AP1 thru 7AP95 Dry Air Pump 216CW 12AN521 thru 12AN660 and 1AP 1 thru 1OAP2695 Conversion Kit 300--1 4AP120 thru 4AP122 and 8AP256 thru 8AP258 Conversion Kit 300-2 2AP30 thru 2AP43, 4AP134, 4AP136 and 4AP137 Conversion Kit 300-3 1AP1 thru 1AP3 Coupling Kit 350 1AP thru 9AP and N/A (Page 1 of 4) Parker Hannlfin Corporation • Airborne Division 711 Taylor Street • Elyria, Ohio 44035 • 440 937-1315 • Fax: 440 937-5409 Technical Service Hotline: 1-800-382-8422 • E-mail: airborne.tech@Parker-H.com • www.parker.com/airborne Airborne. Alr & Fuel Produc!s Service Letter Number: 48 (Continued) Background: It has been determined that the flexible coupling installed in the components listed above may be prone to premature failure. Replacement of these couplings is necessary in order to preclude any early failures of these components Recommend2tion: Prior to IFR fliaht or within the next sixty days, whichever occurs first, inspect/replace the dry air pump flexible coupling per the following procedure on any aircraft which: a) has any of the above dry air pumps installed, b) has any of the above conversion kits installed or c) has had the dry air pump flexible coupling replaced usrng any of the above coupling kits. 1) Remove dry air pump from engine accessory pad per instructions provided by the airframe manufacturer in the appropriate maintenance publication. :·. ir.ser-t e screwdrive~ o~ simiia~ too! between the flexible coupling assembly (2-pis:s ana rhe pumps internal drive coupling. Remove the flexible coupling assembly fror pump. taking care not to damage any of the eight drive pins. Refer to Figure 2. 3) Once the flexi:Jie coupling assembly is removed from pump. separate the frexible coupling and drive shaft by inserting a screwdriver or similar tool between the two components. Refer to Figure 3. 4) Inspect both ends of flexible coupling for presence of a date code. If the format of dare code resembles tnat of a "clockface' and indicates a manufacture date of either 12/97 or 5-6/98. return the flexible coupling assembly to Airborne's Service Department (711 Taylor Street. Elyria, OH, 44035) and then proceed to step number five of this procedure. If date code indicates any other manufacture date. rernstall drive shaft onto flexible coupling by aligning drive pins/holes and pushing the rwo components together. Then, proceed to step number six of this procedure 5) Obtain a replacement flexible coupling kit (Airborne P/N 350) at no-charae from the authorized Airborne distributor from which the dry air pump was purchased or by contacting Airborne Customer Support as follows: Toll Free Number: Direct Phone Number: Fax Number: E-Mail: 800-382-8422 440-937-1315 440-937-5409 airborne.tech@Parker-H.com 6) Reinstall the replacement/inspected flexible coupling assembly onto air pump by pushing it over the drive pins of the pump's internal drive coupling as far as it will go. Do not tap coupling assembly with any device as the pump's bearing may be damaged. (Page 2 of 4) Parker Aerospace Airborne ATTACHMENT "A" PIPER SERVICE BULLETIN NO. 1026 An & Fuei Proauct!. Service Letter Number: 46 (Continued) 7) ldenti7y tni:: o-y air pucnp as having been inspected per this service lette~ by permanently marking (ink stamp, magic marker, etc.) the number of this service letter ('48") on the backflange of the pump near the discharge port. 8) Reinstall dry air pump onto engine accessory pad per instructions provided by the airframe manufacturer in the appropriate maintenance publication. 9) Check for proper operation of a1rcraft pneumatiC system per instructions provided by tne ai:i:ame manufacturer in the appropriate maintenance publication. NOTE A flexible coupling that has already sheared should not be replaced since this may indicate a pneumatic system problem which may have caused internal pump damage. The pump should be returned through normal distribut1on channels for warranty COlJS!aeratiJ:--,. ! I L- == I ·~ FIGURE 1 (Page 3 of 4) Parker Aerospace Airbornl Air & Fuel Products Service Letter 1\iumc.'~r: 46 (Continued; INTERNAL DRIVE COUPLING FIGURE 2 DRIVE SHAFT Flexible Coupling Assembly FIGURE 3 (Page 4 of 4) Parker Aerospace