Go Back  PPRuNe Forums > Aircrew Forums > Rotorheads
Reload this Page >

Helicopter Blades Damaged by Storm Otto

Rotorheads A haven for helicopter professionals to discuss the things that affect them

Helicopter Blades Damaged by Storm Otto

Old 4th Mar 2023, 18:10
  #41 (permalink)  
 
Join Date: Oct 1999
Location: Den Haag
Age: 57
Posts: 6,381
Received 384 Likes on 221 Posts
Hard to understand how it could have been in limits if the brake was unable to stop the rotation. How was that certified? Shutting down outside limits with another technical problem is an ever present dilemma, with no guarantees how it will go. But, in limits? You would reasonably expect to be able to stop the rotor!
212man is offline  
Old 5th Mar 2023, 08:03
  #42 (permalink)  

Avoid imitations
 
Join Date: Nov 2000
Location: Wandering the FIR and cyberspace often at highly unsociable times
Posts: 14,645
Received 520 Likes on 277 Posts
I’ve seen a situation where the wind was so strong that after shutting down the engines the blades continued to autorotate well above the maximum rpm for the use of the rotor brake.
ShyTorque is online now  
Old 5th Mar 2023, 09:35
  #43 (permalink)  
 
Join Date: Dec 2004
Location: Berwick-upon-Tweed
Posts: 83
Received 0 Likes on 0 Posts
Interesting. Sikorsky rotor brakes (S61, S76, S92) may be applied in emergency immediately after engine shutdown with NR still at 100% / 107%, and the AW139 permits application at 90% NR in that situation.
steve_oc is offline  
Old 5th Mar 2023, 09:43
  #44 (permalink)  
 
Join Date: Nov 2004
Location: Australia
Age: 60
Posts: 344
Received 16 Likes on 13 Posts
Originally Posted by steve_oc
Interesting. Sikorsky rotor brakes (S61, S76, S92) may be applied in emergency immediately after engine shutdown with NR still at 100% / 107%, and the AW139 permits application at 90% NR in that situation.
Yes but they work...
Blackhawk9 is offline  
Old 5th Mar 2023, 09:45
  #45 (permalink)  
 
Join Date: Oct 1999
Location: Den Haag
Age: 57
Posts: 6,381
Received 384 Likes on 221 Posts
Originally Posted by steve_oc
Interesting. Sikorsky rotor brakes (S61, S76, S92) may be applied in emergency immediately after engine shutdown with NR still at 100% / 107%, and the AW139 permits application at 90% NR in that situation.
They can also be applied with the engines running (as you know)
212man is offline  
Old 5th Mar 2023, 10:28
  #46 (permalink)  
 
Join Date: Feb 2001
Location: Sometimes here, sometimes there
Posts: 440
Received 6 Likes on 3 Posts
Originally Posted by 212man
Hard to understand how it could have been in limits if the brake was unable to stop the rotation. How was that certified? Shutting down outside limits with another technical problem is an ever present dilemma, with no guarantees how it will go. But, in limits? You would reasonably expect to be able to stop the rotor!
Perhaps it would be more accurate to state that the wind strength reported to the crew was within the shut down limits. As PlasticCabDriver mentions, the rotor brake itself on the H175 isn't the best. Sometimes you select it on and don't perceive any change in the rate of Nr decay!
Variable Load is offline  
Old 6th Mar 2023, 11:58
  #47 (permalink)  
 
Join Date: Jul 2005
Location: Scotland
Posts: 123
Received 82 Likes on 35 Posts
Apologies if this can't be viewed without a subscription:

Video: Footage shows moment Storm Otto rips blades off helicopter
campbeex is online now  
Old 6th Mar 2023, 12:49
  #48 (permalink)  
 
Join Date: Oct 1999
Location: Den Haag
Age: 57
Posts: 6,381
Received 384 Likes on 221 Posts
Originally Posted by campbeex
Apologies if this can't be viewed without a subscription:

Video: Footage shows moment Storm Otto rips blades off helicopter
Iím guessing itís the same video I posted earlier?
212man is offline  
Old 7th Mar 2023, 08:15
  #49 (permalink)  
 
Join Date: Nov 2009
Location: Inverness-shire, Ross-shire
Posts: 1,474
Received 29 Likes on 21 Posts
Originally Posted by 212man
Pretty sure it doesnít. CF is an inertial, or pseudo force
Newton Three!
jimf671 is offline  
The following users liked this post:
Old 19th Feb 2024, 21:42
  #50 (permalink)  
 
Join Date: Mar 2016
Location: Underneath the Radar
Posts: 185
Received 4 Likes on 3 Posts
Update from the AAIB:This statement provides an update on the AAIB investigation into a serious incident involving an EC175 B on the Elgin Platform in the North Sea on 17 February 2023.

The aircraft had shut down on the platform due to a technical fault, but a problem with the rotor brake meant the rotor blades continued to rotate slowly, preventing the application of the rotor blade tie downs. The platform was in the path of Storm Otto, with associated high winds resulting in four of the five main rotor blades breaking off the aircraft. No one was injured.

The AAIB investigation has focused on the cause of the rotor brake failure and the breaking of the rotor blades. It has also looked into operational factors, including weather reporting. The investigation has identified issues with the flight recorder on the aircraft and is working with the aircraft and recorder manufacturers to rectify this.

The full report will be published by the AAIB when complete.

Interesting on the issues with the flight recorder, any ideas on what this could be?
rrekn is offline  
Old 10th Apr 2024, 14:13
  #51 (permalink)  
 
Join Date: Dec 2007
Location: Scotland
Posts: 36
Likes: 0
Received 0 Likes on 0 Posts
Just to update, MCSH returned to the skies on Monday after 415 days and a lot of repairs! Including a new tail boom!
tonkaplonka is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.