YAK-52 directives & MPD’s

 This page has been designed and presented at the request of the UK Civil Aviation Authority. The purpose is to give details of all mandatory modifications and directives for the YAK series of aircraft.

Directives for YAK 50’s

Critical FOD barrier, it is strongly recommended that all operators of YAK 52 fit this barrier. Quote CAA mod number 9/217/M/9741 for compliance (applicable to YAK-52) A similar barrier can be made for the YAK-50 but we have not had that approved yet.

                    

The following MPD’s relate to the YAK 52.

CAP 543, Time limited and task component change record CAP 543 details All a/c coming to the register or those renewing Permits to fly must have this document raised.

Addition of NRV to isolate main systems from starter line MPD: 1997-009, Pneumatic starter isolation .[BU 7/95] to prevent engine starting with air off.

 MPD: 1997-019 R1, Fabric covered surfaces. Ceconite fabric.Rotten fabric The reason why this MPD came into existence.

 Cone and pin type of seat belt MPD: 1997-020 R1, Cone and pin type of seat belt. [old type can come undone inverted!!]

MPD: 1998-001 R2, Vedenyev/ Ivchenko M14P engine life limit. TBO 750 hrs till first OH, then every 500hrs to total of 2250hrs

MPD: 1998-016 R2, Inspection of up-lock piston assemblies every 200hrs or 3 years.Piston corrosion could prevent emergecy gear extension The reason why this MPD came into existence.

MPD: 1998-017 R5, Airframe limitations and overhaul life. Initial airframe life 1000 hrs without spar strap.

MPD: 1998-020, Fabric covered control surfaces. Fabric covered control surfaces.

MPD: 2000-004 Crack appears in area of changing thickness MPD: 2000-004 Crack in elevator control system. Mass balance weight arm.

MPD: 2004-004 air bottles inspection. Remove from a/c and internal inspection.

MPD: 2004-006 fabric barrier in rear fuselage.

The following are mandatory manufactures directives, some extending the airframe life to 5000 hours. Click image to enlarge.

Bulletin applicability calculator for the YAK 52

28 DK, protective guide for mass balance. 28 DK, protective guide for mass balance, protrudes below fin.

53 BD, Brake latch system 53 BD, Brake latch system.

58 DK, 2 parts, cut clearence hole for throttle pitch control rod & move clamp 5 cm forwards of bulkhead 58 DK, 2 parts, cut clearance hole for throttle & pitch rods,+ move clamp 5 cm forwards of throttle bulkhead.

59 R, wing attachments to fuselage 59 R, wing attachments to fuselage in conjunction with 60 R, front & rear spar strengthening.

60 R, new main centre section spar60 R, new center section main spar. 60 R,Not fitted, note no bottom strap. 60 R, not fitted, note no bottom strap.

62 DK, Screws attaching the aileron leading edge mass balance 62 DK, Screws attaching the aileron leading edge mass balance.62DK required if you have this. Old, 62DK not required if you have this. New.

66Rs, front and rear spar attachment bolts 8.5mm 66 R, front and rear spar attachment bolts 8.5mm.

70 BD, rudder mass balance attachment 70 BD, rudder mass balance attachment, note you should be able to see works under fabric.

71 BD oil seperator 71 BD oil seperator.

74 BU, throttle and pitch stops 74 BU, throttle and pitch stops.

75 BU, Aileron spigot support, note the 6 vertical rivets and 2 horizontal 75 BU, Aileron spigot support, note the 6 vertical rivets and 2 horizontal

76 BD, throttle cable rod ends 76 BD, throttle cable rod ends.

80 BD, right rear spar doubler around lightening hole. 80 BD, right rear spar doublers around lightening hole.

 BU 82, stronger fin attachment at base of fin.

87BDs, strenghtening around inner rear spar lightening hole. 87 BU, strengthening around inner rear spar lightening hole, later models port side only.

89 BU, strenghtening around brake rod passing through main spar under front seat. 89 BU, strengthening around brake rod passing through main spar under front seat.

93BD part 1, Strenghtening around rib where mass balance weight passes through at full FWD stick travel 93BD part 1, Strengthening around rib where mass balance weight passes through at full FWD stick travel

93BD part 2, Removal of material to prevent arm from striking rib 93BD part 2, Removal of material to prevent arm from striking rib

93BD part 3, bolts replacing rivets on both upper rudder attachments 93BD part 3, bolts replacing rivets on both upper rudder attachments

Cone and pin type of seat belt 97 BD and UK CAA MPD: 1997-020 R1, Cone and pin type of seat belt

107 BU, Main Spar strenghtening strap, 5000hrs life when fitted. 107 BU, Main Spar strengthening strap, 5000hrs life when fitted, end of strap shown.

Addition of NRV to isolate main systems from starter line BU 7/95 MPD: 1997-009, Pneumatic starter isolation .[BU 7/95] to prevent engine starting with air off.

History behind the need to change to the “G” register.







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