chapter 61 propeller - extra aircraft · pdf filechapter 61 page 5 extra service manual extra...

CHAPTER 61PAGE 1

EXTRASERVICE MANUAL EXTRA 300L

PAGE DATE: 4. June 2009

Chapter 61

Propeller

CHAPTER 61PAGE 2



Table of Contents

Chapter Title

61-00-00 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

61-10-00 PROPELLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

61-20-00 CONTROLLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 561-20-01 Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 761-20-02 RPM Vernier Control Cable . . . . . . . . . . . . . . . . . . . . . 7

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61-00-00 GENERAL

The EXTRA 300L can be equipped with either a MTV-9-B-C/C 200-15 (3-blade), MTV-14-B-C/C 190-17 (4-blade) orMTV-9-B-C/C 198-25 (3-blade) propeller. Maintenancework or overhaul of the propeller requires consultation ofthe propeller manufacturer MT-Propeller.

Proper control,operation and maintenance of the propelleris described in the Operation- and Installation OverhaulManual E-124 of the manufacturer.

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61-10-00 PROPELLER

The MTV-Propellers are made of laminated wood encased inglass-fiber reinforced plastic, which is painted to make itwaterproof.

N O T E For more information about the propeller refer to MT-Propeller Operation- and Installation Manual E-124.

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61-20-00 CONTROLLING

The pitch change is conducted by a propeller governor (referto Figure 1). Once an engine rotational speed is selected itwill be held constant at variations of airspeed and power.

The governor itself is actuated via a vernier control cableending on the left side of the rear cockpit. This cable isrouted on the left side of the fuselage, penetrates the firewall,the rear air baffles and is then routed to the governor. Thecable is attached to the fuselage by a clamp block at its frontend and by self-clinching plastic straps in the cockpit area.The clamp block serves also as a means for rigging. The firewall and air baffle penetration is covered with clamp sheets.The firewall penetration is additionally sealed with PRC-812 (Products Research & Chemical Corp., USA) firewallsealant.

Mechanical stops for low pitch and high pich limit the pitchchange level. In case of the oil pressure of the govenor to belost, the blades automatically return to high pitch, if thecounterweights are installed. The oil pressure is singleacting.

Figure 1,Controlling

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Figure 2,RPM Vernier Control Cable Installation

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61-20-01 Governor

One of the following governors is installed:

MT-Propeller P-880-5, preset for a max. 2700 rpm

MT-Propeller P-880-41, preset for a max. 2600 rpm

Refer to the MT-Propeller Operation- and Installation ManualE-1048 for further information.

NOTE The lever position of the governor actuator is preset.Do not change this position.

61-20-02 RPM Vernier Control Cable

Removal

1 Ensure master switch is off.

2 Remove engine upper cowling per Chapter 71.

3 Remove main and bottom fuselage cover per Chapter53.

4 Remove cotter pin, castle nut, washers and bolt fromthe rod end (1, Figure 2) to governor actuator (2)attachment.

5 Loosen counter nut and remove the rod end (1) fromthe vernier control cable (6).

6 Remove rod end counter nut and vernier control cablerubber parts (4).

7 Remove clamp block (5) attachment bolt.

8 Remove clamp block from the vernier control cable (6).

9 Remove clamp sheet attachment bolts on the rear airbaffle sheet and remove plastic grommets.

10 Remove clamp sheet attachment bolts on the firewalland remove plastic grommets.

11 Mark vernier control cable routing and remove the self-clinching plastic straps.

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12 Remove attachment nut (9) and washer of the verniercontrol unit (7).

13 Pull the vernier control unit aft (about 15 cm) and theninside the cockpit to remove.

14 Pull complete vernier control cable (6) aft to removefrom aircraft. Secure clamp sheets.

Installation

Install in reverse sequence of removal observing the followingitems:

1 Thread the respective clamp sheets on the verniercontrol cable before penetrating the firewall and the rearair baffles.

2 Install rod end (1) with 8 rotations on the vernier controlcable (6). Ensure thread is visible in the inspection hole.Apply inspection lacquer on the counter nut.

3 Renew the sealing of the bushing grooves and gaps atthe engine side of the firewall. Use PRC-812 (ProductsResearch & Chemical Corp., USA) firewall sealant.

5 Tighten the castle nut slightly. Ensure movability of lever.

Rigging

1 Bring vernier control knob (8, Figure 2) to the foremostposition.

2 Check that the travel stop is reached, and if the gapbetween vernier control knob (8) and unit (7) is 5 mm(tolerance +/-1 mm).

3 If not, loosen clamp block attachment bolt and adjustthe vernier control cable position in the clamp block(5).

4 Fasten clamp block attachment bolt.

5 Check full travel.

6 If necessary adjust rod end (1) by the following steps:

a Remove cotter pin, castle nut, washers and bolt fromthe rod end to governor actuator (2) attachment.

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b Loosen the counter nut and adjust rod end by turning.Ensure thread is visible in the inspection hole whenfastening. Apply inspection lacquer on the counter nut.

c Reinstall the rod end to the governor actuator (2).

chapter 61 propeller - extra aircraft · pdf filechapter 61 page 5 extra service manual extra...

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