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2014年3月20日 (木)

3月20日(木)

「Duo Discus Tのプロペラ」

先日もお知らせしましたが、また、別の同型機のプロペラにクラックが発見されました。
Dsc02578

このプロペラは機体製造メーカーであるシェンプヒルト社がコントロールし、
テクノフルーク社が整備しています。

JMGCは両社と打ち合わせを行っています。

シェンプヒルト社はモディファイされたプロペラハブとプロペラプーリーの部品の改造
を提案して来ました。

以下がシェンプヒルト社からの一報です。

Dear Aiichiro,

I received an information from Technoflug that you have again two Duo Discus-T Propellers with cracks in the hub.
Sorry, but it seems that you have really bad luck with the Duo Discus Ts. I do not know in the moment how many Duo Discus T there are in Japan, but the number of cracked propeller hubs in comparison to the number of Duo T must be is frightening. In general the situation is not as bad as it must seem for you (but it is bad enough for an improvement, see below).

I was told that current cases are propeller serial numbers 170 and 143.
I found in my records that prop SN 143 belongs to Duo Discus T SN 149. But I did not find the Duo Discus T for prop SN 170.
For our records and for an occurrence report to EASA I ask for the following data for both aircraft (as far as you have it or as far as you can get it without too much effort):
-serial number and registration of the aircraft
-operator
-occasion at which the defect was detected (scheduled maintenance, preflight check, during flight….or whatever)
-when was the defect detected
-operating time of the propeller
-operating time since latest 5-years inspection

Additionally a picture of the crack(s) is very helpful. For prop SN 143 I have it already.

The most important issue that I can tell you, is that we have modified the hub now. We are quite confident that it will be an improvement or even eliminate the problem completely. SN 143 will be repaired already with the new hub.
With the modified propeller hub the mounting on the belt pulley has slightly changed. A new stop plate and longer dowel pins are necessary. These parts will be delivered directly from Schempp-Hirth (Technoflug does not have these parts in the moment).
In the attachment I send you some working instructions and a drawing for the installation of the new propeller on the belt pulley.

I suggest that we send you the new stop plate and the new dowel pins now already for both propellers SN 170 and 143.

best regards,

Duo Discus Tの所有者は充分注意して毎フライト事のプロペラ点検を行って下さい。

「松ッツアンの電気基礎知識教室」

最近、昼食後に松ッツアンの電気基礎知識教室が開かれています。
今回は点火系統の解説と実験でした。
コイルと誘導電気、一次線とコンデンサーの役目、教科書に書いてある事と実際の違い
等の「目からうろこ」な教室です。

Dsc02572

Dsc02581

「フライトアシスタンスからのお知らせ」

クリーブランド社製のブレーキライニングの交換に必要なブレーキツールが入手されました。現在在庫が1個あります。
価格は5000円です。

Dsc02582

(中澤愛一郎)

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