HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection
Beechcraft King Air 360 · Service Bulletins
Overview
This service bulletin, HC-SB-61-305, issued by Hartzell Propeller Inc. on June 26, 2008, addresses critical safety concerns regarding the propeller mounting bolts on specific Beechcraft King Air models. It applies to the King Air C90GT, B200GT, B300, and B300C aircraft equipped with Hartzell propellers installed in 2007 or 2008. The bulletin outlines the necessary inspections and replacement procedures for propeller mounting bolts to prevent potential propeller separation, which could lead to severe accidents. The document emphasizes the importance of torque specifications and provides compliance timelines for inspections and replacements based on the total time since new (TSN) of the propellers. Pilots and maintenance personnel are advised to follow the instructions closely to ensure safety and compliance with FAA regulations.
- Affected aircraft models include Beechcraft King Air C90GT, B200GT, B300, and B300C.
- Propeller mounting bolts must be inspected and potentially replaced to prevent propeller separation.
- Normal installation torque for mounting bolts is 100 to 105 ft-lbs (136 to 142 N•m).
- A breakaway torque check should be performed at 90 ft-lbs (122 N•m) to ensure bolts are not over-torqued.
- Immediate action is required for propellers with over 600 hours TSN to replace mounting bolts.
Document
Source
Originally published by hartzellprop.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2008
- Pages
- 13
- File size
- 336 KB
- Publisher
- hartzellprop.com
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In this document
Planning Information
The service bulletin details the affected propeller models and serial numbers, specifically the Hartzell HC-E4N-3(G,N) and HC-B4MP-3C, installed on King Air C90GT, B200GT, B300, and B300C aircraft. It warns of the risks associated with bolt failure, including propeller separation, and outlines the need for torque inspections due to a calibration failure of the torque wrench used during installation.
Compliance
The bulletin specifies compliance actions based on the total time since new (TSN) of the propellers. For propellers with less than 200 hours TSN, a torque check must be performed before reaching 200 hours or within 100 flight hours. For propellers with more than 600 hours TSN, immediate bolt replacement is required before further flight.
Accomplishment Instructions
Instructions for performing the torque inspection and bolt replacement are provided. The normal installation torque is specified as 100 to 105 ft-lbs (136 to 142 N•m), with a breakaway torque check at 90 ft-lbs (122 N•m) to avoid over-torquing. Detailed steps for loosening, inspecting, and re-torquing the bolts are included.
Material Information
The bulletin lists the required materials for the replacement of mounting bolts, including part numbers and quantities needed for compliance with the service bulletin.
Hartzell Contact Information
For further assistance, Hartzell Propeller Inc. provides contact details for their product support team, including phone and email information.
Safety notes
- WARNING: BOLT FAILURE MAY RESULT IN SEPARATION OF THE PROPELLER FROM THE AIRCRAFT, leading to potential death or serious injury.
- Unusual or abnormal vibration demands immediate inspection for possible bolt failure.
Full document text
HC-SB-61-305 Page 1 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection 1. Planning Information A. Effectivity (1) Hartzell HC-E4N-3(G,N) lightweight turbine propellers installed by Hawker Beechcraft Company in 2007 or 2008 on new King Air C90GT or B200GT aircraft with aircraft serial number and propeller serial number listed in Table 1 of this Service Bulletin are affected by this Service Bulletin. (2) Hartzell HC-B4MP-3C steel hub propellers installed by Hawker Beechcraft Company in 2007 or 2008 on new King Air B300 or B300C aircraft with aircraft serial number and propeller serial number listed in Table 1 of this Service Bulletin are affected by this Service Bulletin. NOTE: Table 1 lists the affected aircraft model and serial number and the propeller serial number. This table is sorted by the aircraft model and serial number. B. Reason WARNING: BOLT FAILURE MAY RESULT IN SEPARATION OF THE PROPELLER FROM THE AIRCRAFT. FAILURE MAY RESULT IN DEATH, SERIOUS BODILY INJURY, AND/OR SUBSTANTIAL PROPERTY DAMAGE. UNUSUAL OR ABNORMAL VIBRATION DEMANDS IMMEDIATE INSPECTION FOR POSSIBLE BOLT FAILURE. PROPELLER SEPARATION MAY OR MAY NOT BE PROCEEDED BY VIBRATION. (1) The Hawker Beechcraft Company informed Hartzell Propeller Inc. that the propellers were installed on the affected aircraft at the factory using a torque wrench that later failed a calibration test. Refer to Table 1. (2) The torque wrench used during installation of the propellers on the aircraft exceeded the specified mounting torque of 100 to 105 ft. lbs. for the mounting bolts. (3) A check of the torque on the mounting bolts is required to verify the safety of the propeller installation and condition of the mounting bolts. (4) When installed with the incorrect torque, the mounting bolts will experience stresses that can damage the mounting bolt and require bolt replacement before propeller overhaul. © 2008 - Hartzell Propeller Inc. - All rights reserved HC-SB-61-305 Page 2 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection (5) Replacement of the mounting bolts and installation of the propeller with new mounting bolts at the correct torque will correct this problem. (6) Regulatory action is not expected for the propeller assemblies. C. Description (1) This Service Bulletin provides instructions for an on-wing torque inspection of all mounting bolts on the affected propellers. (2) The Service Bulletin provides instruction for replacement of the mounting bolts on the affected propellers HC-SB-61-305 Page 3 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection D. Compliance Propeller Compliance Action (1) For a propeller with less than 200 hours TSN Before propeller TSN is 200 hours or within 100 flight hours from the date of this Service Bulletin, whichever is greater Perform torque check and torque adjustment in accordance with Paragraph 3.A. or bolt replacement in accordance with Paragraph 3.C. in the Accomplishment Instructions section of this Service Bulletin. (2) After initial torque check and torque adjustment in accordance with Paragraph 3.A. in the Accomplishment Instructions section of this Service Bulletin Repetitively perform torque check every 200 flight hours until bolt replacement Perform torque check in accordance with Paragraph 3.B. in the Accomplishment Instructions section of this Service Bulletin. (3) For a propeller with less than 600 hours TSN Before propeller TSN is 600 hours Replace the mounting bolts with new bolts in accordance with Paragraph 3.C. in the Accomplishment Instructions section of this Service Bulletin. (4) For a propeller with greater than 600 hours TSN Before further flight Replace the mounting bolts with new bolts in accordance with Paragraph 3.C. in the Accomplishment Instructions section of this Service Bulletin. (5) At next annual inspection or at any propeller removal from aircraft Replace the mounting bolts with new bolts in accordance with Paragraph 3.C. in the Accomplishment Instructions section of this Service Bulletin. HC-SB-61-305 Page 4 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection E. Approval (1) FAA approval has been obtained on technical data in this publication that affects type design. F. Manpower (1) Approximately 2.0 man-hour per propeller assembly is required to perform the torque inspection. (2) Approximately 3.0 man-hours per propeller assembly is required to perform the propeller mounting bolt replacement. G. Weight and Balance (1) No change H. Electrical Load Data (1) No change I. References (1) Hartzell Propeller Owner's Manual 139 (61-00-39) (2) Hartzell Propeller Owner's Manual 149 (61-00-49) J. Other Publications Affected (1) None 2. Material Information A. Material required Part Number Key Word Qty. B-3339 Bolt 8 B-3339-1 Bolt 8 NOTE 1: Refer to Table 1 for propeller models. NOTE 2: Contact Hawker Beechcraft Corporation for replacement bolts. HC-SB-61-305 Page 5 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection 3. Accomplishment Instructions A. Mounting Bolt Breakaway Torque Inspection and Retorque: (1) Cut and remove the safety wire that secures each propeller mounting bolt. CAUTION: THE NORMAL INSTALLATION TORQUE IS 100 TO 105 FT-LBS. (136 TO 142 N•M) (LUBRICATED). THIS BULLETIN REQUIRES CHECKING TO ONLY 90 FT-LBS. (122 N•M) (IN ORDER TO AVOID POSSIBLE REPETITIVE OVER TORQUING). THE PURPOSE OF THE 90 FT-LB. (122 N•m) CHECK IS TO VALIDATE THAT THE BOLT HAS NOT BEEN OVERTORQUED, DAMAGED, OR CRACKED. (2) Using a calibrated torque wrench and appropriate adapter, verify that the
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breakaway torque on each of the eight mounting bolts is equal to or greater than 90 ft-lbs. (122 N•m) torque by loosening each bolt and noting the breakaway torque. (3) If the breakaway torque of any one bolt is found to be less than 90 ft-lbs. (122 N•m) or any one bolt is found missing or broken, contact Hartzell Propeller Product Support before further flight. CAUTION: LOOSEN ALL PROPELLER MOUNTING BOLTS TO MAKE SURE OF PROPER PRELOADING OF THE MOUNTING BOLTS WHEN THEY ARE RETORQUED. (4) If the breakaway torque on all eight mounting bolts passes the breakaway torque inspection in Paragraph 3.A.(2), loosen each mounting bolt completely. (5) Re-torque all of the propeller mounting bolts in correct sequence, in accordance with the Installation and Removal chapter of the applicable Hartzell Propeller Owner's Manual. The installation torque is 100 to 105 ft. lbs. lubricated. (6) Safety all mounting bolts with 0.032 inch (0.81 mm) minimum diameter stainless steel wire (two bolts per safety). (7) Make a logbook entry indicating compliance with the Mounting Bolt Breakaway Torque Inspection and Retorque section of this Service Bulletin. HC-SB-61-305 Page 6 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection B. Mounting Bolt Torque Inspection: (1) Cut and remove the safety wire that secures each propeller mounting bolt. CAUTION: THE NORMAL INSTALLATION TORQUE IS 100 TO 105 FT-LBS. (136 TO 142 N•M) (LUBRICATED). THIS BULLETIN REQUIRES CHECKING TO ONLY 90 FT-LBS. (122 N•M) (IN ORDER TO AVOID POSSIBLE REPETITIVE OVER TORQUING). THE PURPOSE OF THE 90 FT-LB. CHECK IS TO VALIDATE THAT THE BOLT HAS NOT BEEN DAMAGED OR CRACKED. (2) Using a calibrated torque wrench and appropriate adapter, attempt to tighten each of the eight mounting bolts to 90 ft-lbs. (122 N•m) torque. (3) If the torque of any one bolt is found to be less than 90 ft-lbs. (122 N•m) or any one bolt is found missing or broken, contact Hartzell Propeller Product Support before further flight. (4) If torque on all eight mounting bolts passes the torque inspection, make a logbook entry noting compliance with the Mounting Bolt Torque Inspection section of this Service Bulletin. (5) Safety all mounting bolts with 0.032 inch (0.81 mm) minimum diameter stainless steel wire (two bolts per safety). (6) Make a logbook entry noting compliance with the Mounting Bolt Torque Inspection section of this Service Bulletin. HC-SB-61-305 Page 7 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection C. On-Wing Bolt Replacement (1) Cut and remove the safety wire that secures each propeller mounting bolt. CAUTION: LOOSEN ALL PROPELLER MOUNTING BOLTS TO MAKE SURE OF PROPER PRELOADING OF THE MOUNTING BOLTS WHEN THEY ARE RETORQUED. (2) Loosen each mounting bolt. (3) If any one bolt is found missing or broken, contact Hartzell Propeller Product Support before further flight. WARNING: DO NOT REMOVE ALL PROPELLER MOUNTING BOLTS AT THE SAME TIME WITHOUT PROPERLY SUPPORTING THE PROPELLER. SERIOUS INJURY OR DAMAGE TO THE PROPELLER COULD RESULT. CAUTION: REMOVE ONE MOUNTING BOLT AT A TIME. (4) Remove one mounting bolt at a time and replace with a new mounting bolt. (5) Re-torque all of the propeller mounting bolts in proper sequence, in accordance with the Installation and Removal chapter of the applicable Hartzell Propeller Owner's Manual. The installation torque is 100 to 105 ft. lbs. (136 TO 142 N•m) lubricated. (6) Safety the mounting bolts with 0.032 inch (0.81 mm) minimum diameter stainless steel wire (two bolts per safety). (7) Complete the Report Form on page 8 and return the report form to Hartzell Propeller Inc. (8) Indicate compliance with the bolt replacement requirement for this Service Bulletin in the propeller logbook. (9) Replacement of the mounting bolts is terminating action for this Service Bulletin. D. Hartzell Contact Information Hartzell Propeller Inc. Attn.: Product Support One Propeller Place Piqua, Ohio 45356-2634 USA Phone: 937.778.4379 (Intl. 001.937.778.4379) Fax: 937.778.4391 (Intl. 001.937.778.4391) E-mail: techsupport@hartzellprop.com HC-SB-61-305 Page 8 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection Aircraft Model Number Aircraft Serial Number Propeller Model Right Side Propeller Serial Number Left Side Propeller Serial Number Part Number of Bolts B300C FM19 HC-B4MP-3C FWA4514 FWA4522 B-3339 B300C FM20 HC-B4MP-3C FWA4542 FWA4520 B-3339 B300C FM21 HC-B4MP-3C FWA4540 FWA4535 B-3339 B300C FM22 HC-B4MP-3C FWA4547 FWA4546 B-3339 B300C FM23 HC-B4MP-3C FWA4556 FWA4557 B-3339 B300 FL522 HC-B4MP-3C FWA4387 FWA4393 B-3339 B300 FL523 HC-B4MP-3C FWA4395 FWA4396 B-3339 B300 FL530 HC-B4MP-3C FWA4413 FWA4414 B-3339 B300 FL531 HC-B4MP-3C FWA4415 FWA4380 B-3339 B300 FL533 HC-B4MP-3C FWA4404 FWA4411 B-3339 B300 FL570 HC-B4MP-3C FWA4501 FWA4508 B-3339 B300 FL571 HC-B4MP-3C FWA4523 FWA4518 B-3339 B300 FL572 HC-B4MP-3C FWA4513 FWA4516 B-3339 B300 FL573 HC-B4MP-3C FWA4532 FWA4528 B-3339 B300 FL574 HC-B4MP-3C FWA4531 FWA4439 B-3339 B300 FL575 HC-B4MP-3C FWA4533 FWA4534 B-3339 B300 FL576 HC-B4MP-3C FWA4543 FWA4541 B-3339 B300 FL577 HC-B4MP-3C FWA4539 FWA4537 B-3339 B300 FL578 HC-B4MP-3C FWA4536 FWA4538 B-3339 B300 FL579 HC-B4MP-3C FWA4493 FWA4519 B-3339 B300 FL580 HC-B4MP-3C FWA4526 FWA4525 B-3339 B300 FL581 HC-B4MP-3C FWA4551 FWA4545 B-3339 B300 FL582 HC-B4MP-3C FWA4527 FWA4548 B-3339 B300 FL583 HC-B4MP-3C FWA4565 FWA4554 B-3339 B300 FL584 HC-B4MP-3C FWA4562 FWA4563 B-3339 Affected Aircraft and Propeller Serial Number Sorted by Aircraft Model and Serial Number Table 1 HC-SB-61-305 Page 9 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection Aircraft Model Number Aircraft Serial Number Propeller Model Right Side Propeller Serial Number Left Side Propeller Serial Number Part Number of Bolts B300 FL585 HC-B4MP-3C FWA4559 FWA4558 B-3339 B300 FL586 HC-B4MP-3C FWA4559 FWA4573 B-3339 B300 FL587 HC-B4MP-3C FWA4550 FWA4553 B-3339 B300 FL588 HC-B4MP-3C FWA4564 FWA4552 B-3339 B300 FL589 HC-B4MP-3C FWA4549 FWA4560 B-3339 B200 BB1999 HC-E4N-3G HH2916 HH2917 B-3339-1 B200 BB2000 HC-E4N-3G HH3029 HH3125 B-3339-1 B200GT BY20 HC-E4N-3G HH3126 HH3127 B-3339-1 B200GT BY21 HC-E4N-3G HH3114 HH3116 B-3339-1 B200GT BY22 HC-E4N-3G HH3122 HH3061 B-3339-1 B200GT BY23 HC-E4N-3G HH3150 HH3148 B-3339-1 B200GT BY24 HC-E4N-3G HH3146 HH3151 B-3339-1 B200GT BY25 HC-E4N-3G HH3158 HH3160 B-3339-1 B200GT BY26 HC-E4N-3G HH3165 HH3166 B-3339-1 B200GT BY27 HC-E4N-3G HH3172 HH3173 B-3339-1 B200GT BY28 HC-E4N-3G HH3179 HH3176 B-3339-1 B200GT BY29 HC-E4N-3G HH3016 HH3171 B-3339-1 B200GT BY30 HC-E4N-3G HH3193 HH3195 B-3339-1 B200GT BY31 HC-E4N-3G HH3204 HH3207 B-3339-1 B200GT BY32 HC-E4N-3G HH3229 HH3216 B-3339-1 B200GT BY33 HC-E4N-3G HH3187 HH3129 B-3339-1 B200GT BY34 HC-E4N-3G HH3185 HH3184 B-3339-1 B200GT BY35 HC-E4N-3G HH3270 HH3267 B-3339-1 B200GT BY36 HC-E4N-3G HH3274 HH3268 B-3339-1 Affected Aircraft and Propeller Serial Number Sorted by Aircraft Model and Serial Number Table 1 (Continued) HC-SB-61-305 Page 10 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection Affected Aircraft and Propeller Serial Number Sorted by Aircraft Model and Serial Number Table 1 (Continued) Aircraft Model Number Aircraft Serial Number Propeller Model Right Side Propeller Serial Number Left Side Propeller Serial Number Part Number of Bolts B200GT BY37 HC-E4N-3G HH3273 HH3271 B-3339-1 B200GT BY38 HC-E4N-3G HH3292 HH3294 B-3339-1 B200GT BY39 HC-E4N-3G HH3293 HH3300 B-3339-1 B200GT BY40 HC-E4N-3G HH3310 HH3307 B-3339-1 B200GT BY41 HC-E4N-3G HH3275 HH3263 B-3339-1 B200GT BY42 HC-E4N-3G HH3335 HH3332 B-3339-1 B200GT BY43 HC-E4N-3G HH3286 HH3289 B-3339-1 B200GT BY44 HC-E4N-3G HH3315 HH3318 B-3339-1 B200GT BY45 HC-E4N-3G HH3357 HH3354 B-3339-1 B200GT BY46 HC-E4N-3G HH3327 HH3341 B-3339-1 C90GT LJ1859 HC-E4N-3N HH3121 HH3157 B-3339-1 C90GT LJ1860 HC-E4N-3N HH3087 HH3090 B-3339-1 C90GT LJ1861 HC-E4N-3N HH3152 HH3138 B-3339-1 C90GT LJ1862 HC-E4N-3N HH3094 HH3118 B-3339-1 C90GT LJ1863 HC-E4N-3N HH3161 HH3130 B-3339-1 C90GT LJ1864 HC-E4N-3N HH3135 HH3030 B-3339-1 C90GT LJ1865 HC-E4N-3N HH3167 HH3168 B-3339-1 C90GT LJ1866 HC-E4N-3N HH3144 HH3142 B-3339-1 C90GT LJ1867 HC-E4N-3N HH3154 HH3164 B-3339-1 C90GT LJ1868 HC-E4N-3N HH3181 HH3180 B-3339-1 C90GT LJ1869 HC-E4N-3N HH3132 HH3169 B-3339-1 C90GT LJ1870 HC-E4N-3N HH3194 HH3189 B-3339-1 C90GT LJ1871 HC-E4N-3N HH3201 HH3203 B-3339-1 C90GT LJ1872 HC-E4N-3N HH3186 HH3232 B-3339-1 C90GT LJ1873 HC-E4N-3N HH3215 HH3218 B-3339-1 HC-SB-61-305 Page 11 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection Aircraft Model Number Aircraft Serial Number Propeller Model Right Side Propeller Serial Number Left Side Propeller Serial Number Part Number of Bolts C90GT LJ1874 HC-E4N-3N HH3230 HH3231 B-3339-1 C90GT LJ1875 HC-E4N-3N HH3234 HH3228 B-3339-1 C90GT LJ1876 HC-E4N-3N HH3222 HH3223 B-3339-1 C90GT LJ1877 HC-E4N-3N HH3224 HH3219 B-3339-1 C90GT LJ1878 HC-E4N-3N HH3202 HH3206 B-3339-1 C90GT LJ1879 HC-E4N-3N HH3244 HH3241 B-3339-1 C90GT LJ1880 HC-E4N-3N HH3254 HH3249 B-3339-1 C90GT LJ1881 HC-E4N-3N HH3221 HH3227 B-3339-1 C90GT LJ1882 HC-E4N-3N HH3259 HH3243 B-3339-1 C90GT LJ1883 HC-E4N-3N HH3276 HH3252 B-3339-1 C90GT LJ1884 HC-E4N-3N HH3262 HH3277 B-3339-1 C90GT LJ1885 HC-E4N-3N HH3301 HH3308 B-3339-1 C90GT LJ1886 HC-E4N-3N HH3312 HH3297 B-3339-1 C90GT LJ1887 HC-E4N-3N HH3304 HH3322 B-3339-1 C90GT LJ1888 HC-E4N-3N HH3255 HH3256 B-3339-1 C90GT LJ1889 HC-E4N-3N HH3302 HH3305 B-3339-1 C90GT LJ1890 HC-E4N-3N HH3269 HH3264 B-3339-1 C90GT LJ1891 HC-E4N-3N HH3280 HH3272 B-3339-1 C90GT LJ1892 HC-E4N-3N HH3214 HH3287 B-3339-1 C90GT LJ1893 HC-E4N-3N HH3253 HH3250 B-3339-1 Affected Aircraft and Propeller Serial Number Sorted by Aircraft Model and Serial Number Table 1 (Continued) HC-SB-61-305 Page 12 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection (This page is intentionally left blank.) HC-SB-61-305 Page 13 of 13 Jun 26/08 HARTZELL PROPELLER INC. SERVICE BULLETIN HC-SB-61-305 Propeller - Propeller Mounting Bolt Replacement and Torque Inspection REPORT FORM Propeller Model: Propeller Serial Numbers: #1 #2 Aircraft Serial Number: Reporting Facility: Contact Person: Phone: E-mail: Aircraft Owner: Contact: Phone: Number of mounting bolts replaced: Number of mounting bolts found broken, cracked, or missing: Upon mounting bolt replacement, return this Report Form to Hartzell Propeller Inc., attention Product Support at fax number 937-778-4391.