Fuel system. R = Recommended C = Compulsory INSPECTIONS

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Virgil Murphy
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1 Description of procedures R = Recommended C = Compulsory INSPECTIONS R C :hapter/section/ Subjec Page block concerned /hen the engine comes for inspection, clean the r duct.... Oil system 100 hrs pages Proceed with a sampling for spectrometric analysis Oil drainage... Refer to helicopter Technical Maintenance Manual for draining the tank. 3. Inspection of filtering element Inspection and cleaning of reduction gear and accessory box magnetic plugs (TU164) Inspection, cleaning of magnetic plugs with indicator at oil outlet and gas generator rear bearing oil return (TU208) Inspection and cleaning of gas generator rear bearing oil return strainer Check for clogging of rear bearing 8. Rear bearing cleaning.... Fuel system 1. Replacement of FCU filter element Check for leaks of the injection manifold: Engines POST-MOD. TU80-TU87-TU Engines PRE-MOD. TU80-TU87-TU NOTE hrs 150 hrs NOTE hrs or 1 year 100 hrs NOTE 3 NOTE hrs 750 hrs 100 hrs pages pages pages pages pages pages pages pages pages pages pages 600 Effectivity : A-Al-A Page 2 May 2000

2 NOTE 1 : S.O.A. inspection For several years TURBOMECA has set up a survey of engine by spectrometric analysis of oils. This survey has proved particularly safe for preventing the majority of mechanical discrepancies. Perform the first sampling during the first ground run for installation of the engine in the airframe. This sampling will be used as a reference for the calculation of concentrations and rates of contamination. The inspection should be performed every 100 hours (recommended). The inspection is compulsory every 100 hours if Module 02 or Module 04 has completed more than 3000 operating hours since new or Overhaul. NOTE 2 : Furthermore, inspection of the magnetic plugs of the reduction gear and accessory box will be carried out according to the rate of flights accomplished by each operator, that is : 1) Accessory box magnetic plug - Every 30 hours 2) Reduction gear magnetic plug B PRE-MOD. TU232 Every 8 hours or after the last flight of the day 6 POST-MOD. TU232 Every 30 hours A-A1 POST-MOD. TU13 and PRE-MOD. TU232 Every 8 hours or after the last flight of the day A-A1 PRE-MOD. TU1 3 or POST-MOD. TU232 Every 30 hours A2 every 30 hours. Cleaning of these magnetic plugs will be systematically carried out during routine inspection and only casually in the course of other inspections. NOTE 3 : Check for clogging of gas generator rear bearing - Compulsory every 100 hours: B variant - Compulsory every 450 hours: A-A1 -A2 variants NOTE 4 : Cleaning of the gas generator rear bearing - Compulsory every 1000 hours: B variant - Recommended every 1000 hours: for the other variants Effectivity : A-Al-A2-B Page May 20C

3 , TURBOMECA 1. Check for rear bearing cloaaing A. Necessary conditions REAR BEARING - POWER TURBINE NOZZLE GUIDE VANE MAINTENANCE PROCEDURE The oil temperature must be more than 60 C If not, do a ground run (refer to Chapter ). B. Equipment and materials 1) Tooling C. Procedure a) Mechanic's standard tool kit, plus : - A test tube graduated in ml. WARNING : DO NOT BREATHE OIL VAPORS. MAKE SURE THAT THE AREA WHERE YOU WORK IS OPEN TO THE AIR. DO NOT GET THE OIL ON YOUR SKIN. PUT RUBBER GLOVES AND A FACE SHIELD OR SAFETY GOGGLES. THE OIL CAN BE POISONOUS. I) Remove the rear bearing oil scavenge pipe. 2) Install a vessel beneath the rear bearing scavenge tube. 3) Do a preliminary ventilation until the oil flows (system priming). 4) Install a graduated test tube under the rear bearing scavenge pipe. 5) Do a ventilation for 15 seconds (refer to the procedure given in Chapter ). 0 The min. NG must be of 15 %. The voltage loss must not be less than 15 volts. 0 Beyond these limits, Voltage and NG criteria must be the same through successive checks in order to have reliable records. Effectivity : ALL VARIANTS Page 201 June 1998

4 6) Remove all the oil until the oil flow stops. The quantity of the oil removed must be more than 50 ml (refer to the NOTE 1). a) If the oil does not flow or if the quantity removed is less than 30 ml EXAMINE THE OIL INLET AND THE OIL RETURN TUBES OF THE REAR BEARING (Page block 600 of this chapter) (refer to the NOTE 2), as well as the unions at tube inlets. 0. CLOGGED TUBES OR UNIONS : 0. CLEANTUBES AND UNIONS : CLEAN TUBES AND UNIONS (Page block 700 of this chapter) EXAMINE THE REAR BEARING FOR CLOGGING IF THE QUANTITY OF THE OIL REMOVED IS LESS THAN 50 ml, CLEAN THE REAR BEARING (Page block 700 of this chapter) (refer to the NOTE 3). CLEAN THE REAR BEARING (Page block 700 of this chapter) (refer to the NOTE 3). 0 DRAIN THE OIL SYSTEM (refer to the Chapter , page block 200). b) If the quantity of the oil removed is more than 30 ml and less than 50 ml : - Carbon particles in the strainer or in the filter : EXAMINE THE OIL INLET AND OIL RETURN TUBES AND UNIONS OF THE REAR BEARING (Page block 600 of this chapter). 0. CLOGGED TUBES AND UNIONS : this chapter) 0. CLEANTUBES AND UNIONS : CLEAN TUBES AND UNIONS (Page block 700 of EXAMINE THE REAR BEARING FOR CLOGGING IF THE QUANTITY OF THE OIL REMOVED IS LESS THAN 50 ml, CLEAN THE REAR BEARING (Page block 700 of this chapter) (refer to the NOTE 3). CLEAN THE REAR BEARING (Page block 700 of this chapter) (refer to the NOTE 3). 0 DRAIN THE OIL SYSTEM (Refer to the Chapter , page block 200) Effectivity : ALL VARIANTS Page 202 June 1998

5 - If the strainer and the filter are clean : EXAMINE THE OIL INLET AND OIL RETURN TUBES AND UNIONS OF THE REAR BEARING (Page block 600 of this chapter) DO THE NEXT CHECK AFTER A 25-HOUR OPERATING TIME TO HAVE A TREND MONITORING. c) Write the check and/or the cleaning procedures and also the quantities of the oil removed on the engine log book. NOTE 1 : The check for the rear bearing clogging is a trend monitoring. The coking of the rear bearing depends on the quantity of the oil removed during the different checks. If this quantity is less than the quantity found during the previous checks, you must do another check to make sure that this result is correct, after the engine operation at the idle speed. Example : previous permeability : 80 ml last check : 60 ml - If the result of the check is less than 50 ml, apply the instructions of paragraph 6)b)- - If the difference between two consecutive checks is confirmed (difference in excess of 25 %) apply the instructions of paragraph 6) b), even if the 50 ml limit is not reached. NOTE 2 : In some cases, the concentration of the coke can be at the tubekopper sealbearing junction. Refer to the page block 600 of this chapter. NOTE 3 : After the replacement, the operator can send the rear bearing assembly back to the factory for cleaning. NOTE 4 : Report to TURBOMECA or their Technical Support network (by mail or by fax) any cleaning procedure performed. Review module or engine data. 7) 8) Make sure internal walls of the rear bearing oil scavenge pipe are clean. Remove the strainer-holder from the rear bearing oil return line : - Examine and clean the strainer-holder and the strainer (refer to Chapter ). Effectivity : ALL VARIANTS Page 203 May 2000

6 TEMPORARY REVISION NO (A-A1 -A2-B) REAR BEARING - POWER TURBINE NOZZLE GUIDE VANE CLEANING 1. Cleaning of the rear bearina-pt noule-auide-vane assembly A. Necessary conditions Remove the rear bearing-pt noule-guide-vane assembly. Refer to the page block 400 of this chapter. I Do the check of the relative position of the 2"d stage turbine blades. Refer to page 615. B. Equipment and materials 1) Tooling a) The mechanic's standard tool kit, plus : - Atank - A thermometer 1 15 C (239 F) - A nylon brush - A reamer or a drill bit of 0.8 mm (0.032 in) and 0.9 mm (0.036 in) in diameter - The drill bits (ID of the tubes : mm) ( in) - A cytindrical brush (for the gun barrels). 2) Materials - Descaler for the hot sections - Cleaners }Chapter , paragraph 3. Facing page 701, Effectivity : AA Page 12/12 September 2000

7 ARRIEL 1 REAR BEARING - POWER TURBINE NOZZLE GUIDE VANE CLEANING 1. Cleanina of the rear bearina-pt nozzle-auide-vane assembly A. Necessary conditions Remove the rear bearing-pt noule-guide-vane assembly. Refer to the page block 400 of this chapter. 8. Equipment and materials 1) Tooling a) The mechanic's standard tool kit, plus : - Atank - A thermometer 11 5 C (239 F) - A nylon brush - A reamer or a drill bit of 0.8 mm (0.032 in) and 0.9 mm (0.036 in) in diameter - The drill bits (ID of the tubes : mm) ( in) - A cylindrical brush (for the gun barrels). 2) Materials - Descaler for the hot sections - Cleaners ] Chapter , paragraph 3. Effectivity : ALL VARIANTS Page December 19

8 I C. I Cleaning of the PT nozzle guide vane (PT NGV), the rear bearing, the cover, the cage, the screws and the deflector. WARNING : DO NOT GET THE DESCALERS ON YOUR SKIN. THE DESCALERS ARE VERY STRONG ALKALIS. PUT THE RUBBER GLOVES AND A FACE SHIELD OR THE SAFETY GOGGLES. IF YOU GET THE DESCALERS ON YOUR SKIN, CAREFULLY CLEAN WITH SOME WATER AND APPLY A BORIC ACID SOLUTION. 1) Put the parts into a tank and attach them to the edge of the tank with lockwire. CAUTION: MAKE SURE THAT THE LEVEL OF THE DESCALER IS BELOW THE ABRADABLE OF THE LABYRINTH COVER ASSEMBLY. 2) Put the descaler for the hot sections (40 Yo descaler, 60 Yo water). 3) Heat the assembly. Obey the instructions given in the NOTE about the descalers for the hot sections (Chapter paragraph 3). WARNING : BE VERY CAREFUL WHEN YOU USE THE BATH TO PREVENT A BURN. 4) Remove the parts, remove the lockwire from the cage. I 5) Do a first rinsing of the parts. 6) Flush carefully the parts with some cold water while you brush the inside of the parts with the nylon brush. 7) Flush the parts with some hot water 8) Dry at 100 C (212 F) in an oven or with some dry compressed air. 9) Do the procedure again, if necessary. Effectivity : ALL VARIANTS Page 702 May 2000

9 ARRlEL 1 TURBOSHAFT ENGINE D. Cleaning of cage and inlet union calibrated orifice (Refer to figure 701) NOTE : Only the cage and the PT NGV were previously cleaned. 1) Clean the calibrated orifice of the cage and union with an applicable drill bit or reamer, 18 mm (0.708 in) in length. 2) Inject dry compressed air through the calibrated orifice PostTU281 { Sharp edge /&- Jet Pre TU281 01,7 1;' Pre TU281 01,4 I:*' Post TU281 I Effectivity : ALL VARIANTS Cage and inlet union calibrated orifice - Cleaning Figure Page 703 June 1998

10 ARRIEL 1 E. Cleaning of the tubes 1) 2) Clean the tubes with a cleaner (refer to the Chapter ) and a nylon brush. Decarbonize the inside of the tubes with a drill bit of the applicable diameter, or with a cylindrical brush (for the riffle barrels). F. Cleaning of the outer ring, the separator and the rollers of the bearing For the procedures below : WARNING : DO NOT GET THE DESCALERS ON YOUR SKIN. THE DESCALERS ARE VERY STRONG ALKALIS. PUT THE RUBBER GLOVES AND A FACE SHIELD OR THE SAFETY GOGGLES. IF YOU GET THE DESCALERS ON YOUR SKIN, CAREFULLY CLEAN WITH SOME WATER AND APPLY A BORIC ACID SOLUTION. Put fully the parts into a bath of the descaler for the hot sections (Refer to the Chapter paragraph 3). Heat (refer to the specification of the descaler, Chapter paragraph 3). Remove the parts. Do a first rinsing of the parts. Flush carefully the parts with some cold water while you brush the inside of the housing with a nylon brush. Flush with some hot water. Dry the parts with some dry compressed air, then dry them at 100 C (212 F) in an oven. Make sure that the rollers tum freely and smoothly. Do the procedure again, if necessary. 10) Put the parts fully into some engine oil after the cleaning. Effectivity : ALL VARIANTS Page December 1995

Module 13: Mechanical Fuel Injection Diagnosis and Repair

Module 13: Mechanical Fuel Injection Diagnosis and Repair Terms and Definitions Parts of Injection Nozzles Types of Nozzle Valves Operation of an Injection Nozzle Fuel Flow Through the Unit Injector Optional Features on Fuel Injection Pumps Main Parts of a Distributor-Type