HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft 1. Planning Information A. Effectivity (1)
Hartzell HC-C2Y(K,R)-1BF/ F8477-4 propellers, with TKS anti-ice system, installed on Socata TB-20 and TB-21 aircraft with aircraft serial numbers 2038 and below. (a)
Affected propellers have had anti-ice boots installed by the airframe manufacturer per TKS (Aircraft De-icing) Ltd. Procedure P232, "Specification for the Attachment of Propeller Overshoes."
(b)
Propellers that have been overhauled per the applicable Hartzell manuals and have had the anti-ice boots installed in accordance with Hartzell Manual 133C (ATA 61-13-33), Aluminum Blade Overhaul, or AS&T Procedure 4700INS are not affected by this bulletin.
B. Concurrent Requirements None. C. Reason (1)
April 10/01
Affected propellers have anti-ice boots installed in accordance with TKS (Aircraft De-icing) Ltd. Procedure P232, "Specification for the Attachment of Propeller Overshoes". This procedure required the installer to remove the paint from the area of the blade where the boot is to be installed. (a)
These anti-ice boots were not installed at the Hartzell factory. Procedure P232 is in conflict with published Hartzell instructions regarding anti-ice boot installations.
(b)
A propeller with anti-ice boots installed by the airframe manufacturer was returned to Hartzell for correction of a service problem. This propeller was found to have both the paint and the anodized coating of the blade removed prior to installation of the anti-ice boots.
(c)
Removal of paint and the anodized layer of the blade can lead to corrosion of the propeller blade beneath the boot. Blade corrosion produces a stress riser on the blade, with the potential for subsequent blade failure initiating at the corroded area(s).
(d)
In the case cited above, the outline of the boot was scribed on the blade with a sharp object prior to the removal of paint and anodize. This scribed line penetrated the blade paint and scratched the blade surface. This produced a stress riser on the blade, with the potential for subsequent blade failure initiating at the scribed area(s). HC-ASB-61-251 Page 1 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft (2)
TKS Procedure P232 has been in use at the airframe manufacturer since its original publication date of July 1983. The total number of propellers where antiice boots were installed using this procedure is unknown. It is believed that all antiice boots installed by the airframe manufacturer were installed using this procedure.
(3)
This bulletin provides a procedure to inspect for the conditions described above and provides corrective action.
(4)
Regulatory action (Airworthiness Directive) is possible.
D. Description (1)
This Service Bulletin provides a procedure to correct blade damage or the potential for blade damage that may have been caused when TKS (Aircraft Deicing) Ltd. Procedure P232, "Specification for the Attachment of Propeller Overshoes" was used to install anti-ice boots.
E. Compliance (1)
Affected propellers with less than 500 hours and less than three years TSN: Compliance is required within 200 hours from the effective date of this bulletin, not to exceed 600 hours TSN, or prior to accumulating four years TSN, whichever occurs first.
(2)
Affected propellers with 500 or more hours or more than three years TSN, but less than 6 years TSN: Compliance is required within 100 hours, or one year from the effective date of this bulletin, whichever occurs first.
(3)
Affected propellers with six years TSN or more: Compliance is required within 50 hours, or six months from the effective date of this bulletin, whichever occurs first.
NOTE 1: Although the inspection and repair procedure specified by this Service Bulletin closely mirrors that of a blade airfoil overhaul, compliance with this bulletin will not be considered compliance with blade or propeller overhaul. NOTE 2: Propeller overhaul can be performed at the discretion of the customer instead of the inspection and repair procedures specified by this Service Bulletin. F. Approval FAA approval has been obtained on technical data in this publication that affects type design.
April 10/01
HC-ASB-61-251 Page 2 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft G. Manpower Procedure 1: Propeller Removal/Reinstallation Propeller Disassembly/Assembly Anti-ice boot removal Blade paint and anodize removal Dimensional inspection Dye penetrant inspection Re-anodize and repaint Anti-ice boot Installation Lubricate and static balance Total
1.5 man-hours 3.0 man-hours 1.0 man-hour 1.5 man-hours 0.5 man-hour 0.3 man-hour 1.0 man-hour 0.5 man-hour 0.3 man-hour 9.3 man-hours
Procedure 1 must be accomplished by an authorized propeller repair station. Procedure 2: Propeller Removal/Reinstallation Anti-ice boot removal Blade paint and anodize removal Dimensional inspection Dye penetrant inspection Chemical conversion coat and repaint Anti-ice boot Installation Lubricate and dynamic balance Total
1.5 man-hours 1.0 man-hour 2.0 man-hours 0.5 man-hour 0.6 man-hour 2.5 man-hours 0.5 man-hour 1.0 man-hour 9.6 man-hours
Procedure 2 may be accomplished by an authorized mechanic. H. Weight and Balance Total propeller weight will not be affected by this bulletin, but propeller must be statically balanced if Procedure 1 is performed, and must be dynamically balanced if Procedure 2 is performed to ensure proper propeller balance prior to return to service. I.
Electrical Load Data Not Affected
April 10/01
HC-ASB-61-251 Page 3 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft J. References Hartzell Manual 113B (ATA 61-10-13), Compact Non-Feathering (-1) and Aerobatic (-4) Propeller Maintenance Manual. Hartzell Manual 115N (ATA 61-00-15), Propeller Owner's Manual. Hartzell Manual 133C (ATA 61-13-33), Aluminum Blade Overhaul. Hartzell Manual 202A (ATA 61-01-02), Standard Practices Manual. Aircraft Maintenance Manual (AMM) K. Other Publications Affected None 2. Material Information A. Consumables, Procedures 1&2 CM or Part Number A-6574-4 79980-HPI-LO CM12 CM24 CM25 CM26 CM28 CM32 CM31 CM33 CM34 CM36 NOTE:
April 10/01
Keyword Decal, Blade Ident. Decal, Hartzell Logo Lubricant Wash Primer Reducer, Wash Primer Acid Diluent Catalyst Reducer Accelerator Paint, Black Polane Paint, Gray Polane Paint, White Polane
Qty 2 2 A/R A/R A/R A/R A/R A/R A/R A/R A/R A/R
All CM references in this Service Bulletin will be to Hartzell Manual 61-01-02, Standard Practices Manual.
HC-ASB-61-251 Page 4 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft B. Expendables, Procedure 1 Part Number A-2043-1 B-3359 B-3838-3-5 B-3883-4339 B-6747 C-3317-348-1 C-3317-247 C-3317-115-1 C-3317-228 TKS MHG 2841 NOTE:
Keyword Nut, Self Locking Stop nut, elastic Pin, Cotter Seal, Quad Ring Seal, Washer O-Ring, Piston OD O-Ring, Cylinder O-Ring, PC rod, engine side O-ring, Flange Anti-Ice Boot
Fig/Item No. 10-1-280 10-1-10 10-1-60 10-5-540 10-1-30 10-1-80 10-1-170 10-1-220 10-7-320 N/A
Qty 10 1 1 2 1 1 1 1 1 2
Figure/Item numbers refer to Hartzell Manual 113B (ATA 61-10-13).
C. Expendables, Procedure 2 Part Number C-3317-228 TKS MHG 2841
Keyword O-ring, Flange Anti-Ice Boot
Fig/Item No. 10-7-320 N/A
Qty 1 2
3. Accomplishment Instructions A. Record Search (1)
Perform a propeller record and logbook search. Note the following: (a)
Propellers that had anti-ice boots installed after delivery of the aircraft , and were installed using a Hartzell approved procedure, or AS&T Procedure 4700INS are not affected by this bulletin.
(b)
Propellers that have been overhauled per the applicable Hartzell manuals and have had the anti-ice boots installed in accordance with Hartzell Manual 133C (ATA 61-13-33), Aluminum Blade Overhaul, are not affected by this bulletin.
(2)
If a search of propeller records indicate that either Paragraph 3.A.(1).(a) or 3.A.(1).(b) are applicable, make an entry in the propeller log book that compliance with Alert Service Bulletin HC-ASB-61-251 is not required.
(3)
If a search of propeller records indicate that Paragraph 3.A.(1).(a) or 3.A.(1).(b) are not applicable, perform the procedures under Paragraph 3.B or 3.C. of this Alert Service Bulletin.
April 10/01
HC-ASB-61-251 Page 5 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft B. Procedure 1 (Preferred Method) NOTE: (1)
(2)
Two procedures are provided, but only one need be performed. Procedure 1 is the preferred method, and Procedure 2 is an alternate method.
Propeller Removal and Disassembly (a)
Remove the propeller from the aircraft in accordance with Hartzell Manual 115N (ATA 61-00-15) and the Aircraft Maintenance Manual (AMM).
(b)
Disassemble the propeller to the point of blade removal in accordance with Hartzell Manual 113B (ATA 61-10-13).
(c)
Clean the hub and pitch change components and set aside.
Blade Inspection Inspect each blade in the propeller assembly according to the following procedure. (a)
Mask the blade shank and blade bore to protect the blade shank and blade bore from contamination or exposure to chemical etching solution.
(b)
Remove anti-ice boot in accordance with the De-icer Boot chapter of Hartzell Manual 133C. CAUTION:
(c)
(3)
(4)
April 10/01
USE CAUTION WHEN WORKING AROUND THE BLADE RETENTION RADIUS TO AVOID SCRATCHING OR OTHERWISE DAMAGING THE RETENTION RADIUS. ANY DAMAGE TO THE BLADE RETENTION RADIUS OR BLADE BORE WILL REQUIRE BLADE SHANK OVERHAUL IN ACCORDANCE WITH THE BLADE SHANK OVERHAUL CHAPTER OF HARTZELL MANUAL 133C.
Remove the paint from the entire blade (except the blade shank) using an approved paint removal procedure in accordance with Hartzell Manual 202A or 133C.
Rework/grind the blade surface as required to remove: (a)
Any scribe marks or other damage related to the installation of the anti-ice boot.
(b)
In-service damage or erosion.
Dimensionally inspect the width and thickness of the blade in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
HC-ASB-61-251 Page 6 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft (5)
Polish the blade surface in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
CAUTION:
DO NOT APPLY CHEMICAL ETCHING SOLUTION TO THE BLADE RETENTION RADIUS. CHEMICAL ETCHING SOLUTION REMOVES MATERIAL. IF CHEMICAL ETCHING SOLUTION COMES IN CONTACT WITH THE RETENTION RADIUS, THE RETENTION RADIUS MUST BE ROLLED, DIMENSIONALLY INSPECTED, AND INSPECTED ON THE OPTICAL COMPARATOR.
(6)
Chemically etch the blade surface in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
(7)
Inspect the blade airfoil with dye penetrant in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
(8)
Blade Refinishing (a)
Re-anodize, or apply chemical conversion coating to the blade in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
(b)
Repaint the entire blade in accordance with the Finish Chapter of Hartzell Manual 133C.
(c)
Install anti-ice boots in accordance with the De-Icer Boot Chapter of Hartzell Manual 133C.
NOTE:
(9)
April 10/01
Application procedures used for the TKS anti-ice boots and the BFGoodrich boots referenced in Manual 133 are identical. The "X" dimension (distance from the hub to the end of the boot) is 1.25 inches (31.75 mm).
Propeller Assembly and Installation (a)
Assemble the propeller in accordance with Hartzell Manual 113B (ATA 6110-13).
(b)
Lubricate and statically balance the propeller in accordance with Hartzell Manual 113B (ATA 61-10-13).
(c)
Install the propeller on the aircraft in accordance with Hartzell Manual 115N (ATA 61-00-15) and the Aircraft Maintenance Manual (AMM).
(d)
Optionally, perform dynamic balance on propeller in accordance with Hartzell Manual 202A.
(e)
Record compliance with this Alert Service Bulletin in the propeller log book. HC-ASB-61-251 Page 7 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft C. Procedure 2 (Alternate Method) NOTE: (1)
Two procedures are provided, but only one need be performed. Procedure 1 is the preferred method, and Procedure 2 is an alternate method
Blade Inspection (a)
Remove the propeller from the aircraft in accordance with Hartzell Manual 115N (ATA 61-00-15) and the Aircraft Maintenance Manual (AMM).
NOTE: CAUTION:
(2)
Propeller removal is required to properly perform the dye penetrant inspection. THE FOLLOWING INSPECTION AND REWORK PROCEDURE DOES NOT REQUIRE PROPELLER DISASSEMBLY. DO NOT ALLOW SOLVENTS, CAUSTIC CHEMICALS, PAINTS, ETC. TO COME IN CONTACT WITH THE BLADE SEAL AREA OR THE BLADE SHANK. MASK OFF THE BLADE SHANK TO PROTECT THE SEAL AND SHANK. POSITION THE PROPELLER BLADE TO ALLOW LIQUIDS, ABRASIVE RESIDUE, ETC. TO BE DIRECTED AWAY FROM THE BLADE SHANK.
(b)
Remove anti-ice boot in accordance with the De-icer Boot chapter of Hartzell Manual 133C.
(c)
Remove the blade paint surrounding the deice boot area using an approved paint removal procedure in accordance with Hartzell Manual 202A or 133C. Remove paint at least 1 inch (2.5 cm) beyond the former edge of the anti-ice boot.
Rework/grind the blade surface as required to remove: (a)
Any scribe marks or other damage related to the installation of the anti-ice boot.
(b)
In-service damage or erosion.
(3)
Dimensionally inspect the width and thickness of the blade in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
(4)
Polish the blade surface in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
April 10/01
HC-ASB-61-251 Page 8 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft CAUTION 1:
DO NOT ALLOW CHEMICAL ETCHING SOLUTION TO CONTACT THE BLADE SEAL AND/OR BLADE RETENTION RADIUS. CHEMICAL ETCHING SOLUTION REMOVES MATERIAL. IF CHEMICAL ETCHING SOLUTION COMES IN CONTACT WITH THE RETENTION RADIUS, THE RETENTION RADIUS MUST BE ROLLED, DIMENSIONALLY INSPECTED, AND INSPECTED ON THE OPTICAL COMPARATOR.
CAUTION 2:
CHEMICAL ETCHING SOLUTION WILL DAMAGE PAINTED SURFACES.
(5)
Chemically etch the blade surface in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C. Etching solution must be applied continuously for 5 minutes.
CAUTION:
DYE PENETRANT SOLUTION WILL DAMAGE PAINTED SURFACES.
(6)
Inspect the blade airfoil with dye penetrant in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
(7)
Blade Refinishing (a)
Remove any paint damaged/stained by contact with etching solution and/or dye penetrant. Feather the paint around the repaired area to prepare the entire blade surface for repainting.
(b)
Apply chemical conversion coating to the exposed aluminium blade surface in accordance with the Blade Airfoil Overhaul Chapter of Hartzell Manual 133C.
(c)
Repaint the blade in accordance with the Finish Chapter of Hartzell Manual 133C.
(d)
Install anti-ice boots in accordance with the De-Icer Boot Chapter of Hartzell Manual 133C.
NOTE:
April 10/01
Application procedures used for the TKS anti-ice boots and the BFGoodrich boots referenced in Manual 133 are identical. The "X" dimension (distance from the hub to the end of the boot) is 1.25 inches (31.75 mm).
HC-ASB-61-251 Page 9 of 10
HARTZELL PROPELLER INC.
ALERT SERVICE BULLETIN Propellers Inspection of Two-Bladed Propeller With Anti-Ice System Installed on Socata TB-20, TB-21 Aircraft (8)
Install the propeller on the aircraft in accordance with Hartzell Manual 115N (ATA 61-00-15) and the Aircraft Maintenance Manual (AMM).
(9)
Dynamically balance the propeller in accordance with Hartzell Manual 202A.
(10)
Record compliance with this Alert Service Bulletin in the propeller log book.
April 10/01
HC-ASB-61-251 Page 10 of 10
