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

Sikorsky S-92: From Design to Operations

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

Sikorsky S-92: From Design to Operations

Old 12th Nov 2010, 10:40
  #1941 (permalink)  
 
Join Date: Feb 2005
Location: not where I want to be
Posts: 55
I hope the president brings his earplugs and anti vibration cushion with him

Last edited by rotorknight; 12th Nov 2010 at 10:40. Reason: typo
rotorknight is offline  
Old 24th Nov 2010, 12:51
  #1942 (permalink)  
 
Join Date: Mar 2003
Location: the hills of halton
Age: 68
Posts: 775
Sikorsky are asking for excusable delay in delivery of first evaluation aircraft

Third delay for helicopters to replace Sea Kings - thestar.com

No sure how long a short delay is , hopefully less than a year

HALIFAX—There has been a third delay in the delivery of a new navy helicopter slated to replace a fleet of decades-old Sea Kings, the federal government said Tuesday.
A spokeswoman for Public Works Minister Rona Ambrose says U.S.-based Sikorsky has informed the federal government it won’t meet a Nov. 30 deadline for delivery of early versions of the Cyclone helicopters used for testing and evaluation.
Rebecca Thompson said Sikorsky considers the delay “excusable” under its contract but Public Works will determine if any penalties should be applied. Thompson said if Ottawa rejects Sikorsky’s argument, the department could implement a fine of $45,000 for each day, up to a maximum of 120 days, the delivery of the chopper is late.
“When we sign a contract, we expect a contractor to deliver on time,” Thompson said in an email. “This case is no different.”
The federal government originally ordered 28 of the Cyclones in 2004 with a delivery date of November 2008, but it has announced delays in the more than $5-billion contract on at least two previous occasions.
In her Oct. 26 report, federal auditor general Sheila Fraser slammed the project for huge cost overruns and delays. She said the total cost of buying all of the helicopters, which operate off the decks of navy frigates and are intended to replace the aging Sea King fleet, would likely top $5.7 billion and come in seven years late.
Thompson said she did not know when the training and evaluation helicopters would be available, but added that Sikorsky said it is sticking to its plan to begin delivering the fully-equipped, final version of the helicopters by June 2012.
A spokesman for Sikorsky said the delay was beyond the company’s control.
“We have notified the Crown that there will be a short delay in delivery of the first aircraft due to an issue outside of our control,” Paul Jackson said in an email. “Our contract contains provisions for such events and we are now in discussions with the Crown in keeping with those provisions.”
widgeon is offline  
Old 24th Nov 2010, 22:13
  #1943 (permalink)  
 
Join Date: Mar 2002
Location: Canada
Posts: 690
The target of 30 November was set just 5 months earlier!

From the Globe and Mail.

Sources said that the biggest obstacle to the first delivery is related to the certification of the aircraft, which might have been delayed by mechanical problems.
zalt is offline  
Old 25th Nov 2010, 02:49
  #1944 (permalink)  
 
Join Date: Dec 2000
Location: Arlington, Tx. US
Posts: 618
$200 Million apiece! And people wanted this as a "cheap" alternative to the much more sophisticated $70M Osprey.

The Sultan
The Sultan is offline  
Old 25th Nov 2010, 22:14
  #1945 (permalink)  
 
Join Date: Jan 2007
Location: here and there
Age: 64
Posts: 137
Rotornight have you been in a S92 with the dual VCAS system? Is much smoother then the single version, plus I would assume a VIP aircraft has more insulation to dampen the noise then the utility versions. Even they are not all that bad for interior noise.
twisted wrench is offline  
Old 6th Dec 2010, 22:14
  #1946 (permalink)  
 
Join Date: Feb 2001
Location: US
Posts: 604
According to Aviation Week, Sikorsky is going to release a new gearbox for the S-92: Sikorsky Unveils New Gearbox for S-92A | AVIATION WEEK
OFBSLF is offline  
Old 7th Dec 2010, 05:19
  #1947 (permalink)  
 
Join Date: Feb 2001
Location: Sometimes here, sometimes there
Posts: 410
OFBSLF,

I thought this was common knowledge, but obviously not! However the Phase II and Phase III MGBs are not really "new MGBs", just new casings. The Phase III is effectively the same casing that was designed for the heavier CH148 Cyclone.

My prediction for the future - there will be a totally new MGB released in the next 2-3 years.
Variable Load is online now  
Old 7th Dec 2010, 07:03
  #1948 (permalink)  
 
Join Date: Nov 2007
Location: Poland
Posts: 178
The Sultan, It's ASW/ASuW platform, there is nothing more expensive than this.

The aircraft can be worth 30M USD, but when you put 100M USD worth of electronics on it... well, the price goes up as much... unless you buy those in bulk, like the US Navy does with Romeo/Sierra S-70 models. Plus that price is not for aircraft alone.
Lt.Fubar is offline  
Old 7th Dec 2010, 14:35
  #1949 (permalink)  
 
Join Date: Feb 2001
Location: US
Posts: 604
I thought this was common knowledge, but obviously not!
I'm just SLF, so it may be common knowledge in the community.

However the Phase II and Phase III MGBs are not really "new MGBs", just new casings. The Phase III is effectively the same casing that was designed for the heavier CH148 Cyclone.
That was my guess, even though the article wasn't particularly clear on that point.
OFBSLF is offline  
Old 8th Dec 2010, 04:19
  #1950 (permalink)  
 
Join Date: Dec 2009
Location: in my house
Posts: 118
I thought this was common knowledge, but obviously not!
common knowlege amoungst those who need to know.

the phase I and II casings were quite similar only a small redesign. the phase III is very different.
ironchefflay is offline  
Old 9th Dec 2010, 04:14
  #1951 (permalink)  
 
Join Date: Sep 2007
Location: USA
Posts: 602
S-92 MRGB housing casting update:

Sikorsky Unveils New Gearbox for S-92A | AVIATION WEEK
riff_raff is offline  
Old 21st Dec 2010, 13:10
  #1952 (permalink)  
 
Join Date: Nov 2003
Location: U.K.
Posts: 1,066
Flight from rig aborted by helicopter crew - Local - News - The Telegram


A Monday morning helicopter flight from the oil rig Henry Goodrich was scrapped, after heavy vibrations were felt shortly after takeoff, the Canada-Newfoundland Offshore Petroleum Board (C-NLOPB) has noted.
The helicopter is reported to be a Sikorsky S-92 and flew up 150 metres before turning back to land.
There were 18 onboard the flight. No injuries were reported.
As part of new reporting system, the C-NLOPB posted notice of the incident on its website. The notice is available at C-NLOPB || Welcome to cnlopb.nl.ca, under "media centre," "incident reports."
More information will be available in Tuesday's edition of The Telegram.
Regards
Aser
Aser is offline  
Old 21st Dec 2010, 18:59
  #1953 (permalink)  
 
Join Date: Feb 2007
Location: all over?
Posts: 250
Most likely the AVC (Active Vibration Compensation) dropped out - I hope. This gives a very marked increase in felt vibration, and happens from time to time although is not serious at all if that is what it was. There are plenty of other non-serious causes that are possible, and the crew did the right thing to return as they were so close to a deck, as there would have been some doubt and any increase in vibration should be investigated. This has happened plenty of times before and has almost always been a non-serious cause that could have been safely flown away indefinitely. Don't automatically assume the worst.
It is a bit unfortunate though that every single action is now publicly published and scrutinised before any cause or information relating to the incident is known causing increased panic and paranoia where it is most likely not justified. If it is a serious incident, then by all means discuss and print, but why not wait until more details are known. This does not benefit anyone in my opinion.
Horror box is offline  
Old 21st Dec 2010, 19:12
  #1954 (permalink)  
 
Join Date: Dec 2000
Location: Arlington, Tx. US
Posts: 618
Horror,

You left out the vibration due to tail rotor bearing failures which has caused a number of incidents a while back.

Did not know an AVC would be needed just coming off a pad. It thought they were normally for high speed.

The Sultan
The Sultan is offline  
Old 21st Dec 2010, 19:44
  #1955 (permalink)  
 
Join Date: Jan 2007
Location: Land of the Trolls
Posts: 56
AVC is normally on all during the flight
Like Horror Box said there is a notable difference when they drop off line occasionally

PV
Paddyviking is offline  
Old 21st Dec 2010, 20:17
  #1956 (permalink)  
 
Join Date: Feb 2007
Location: all over?
Posts: 250
You left out the vibration due to tail rotor bearing failures which has caused a number of incidents a while back.

Did not know an AVC would be needed just coming off a pad. It thought they were normally for high speed.
I did not say there have not been nor could not be a serious incident, hence the crew returned, but I am stating that the most likely thankfully is not serious, and bearing failures and other serious failures have been extremely rare.
And as Paddy says, the AVC is on all the time, and is used all the time. Fly without it and kiss goodbye to a good-nights sleep for a few nights as your tinnitus will be roaring like a good 'un!
Horror box is offline  
Old 21st Dec 2010, 22:59
  #1957 (permalink)  
 
Join Date: Jun 2006
Location: In the air with luck
Posts: 1,007
Please explain where the vibs are coming from to require AVC, why is it not possible to produce a machine that is inherently smooth, it would appear that another expensive electro mechanical device is required ?, you say it drops off line occasionally ! define occasionally. when will this fault be rectified.
As pilots we accept these glitches to readily.
500e is offline  
Old 21st Dec 2010, 23:33
  #1958 (permalink)  
 
Join Date: Mar 2002
Location: Canada
Posts: 690
What like a 5 bladed rotor?

This is CNLOPB's new get tougth attempt after they appointed their own, ex-military, aviation advisors as it is clear TCCA did not impress the Inquiry.
zalt is offline  
Old 22nd Dec 2010, 01:27
  #1959 (permalink)  
 
Join Date: Oct 1999
Location: Nigeria
Age: 54
Posts: 4,807
500e,
'AVC type' devices are quite common and are not specific to the S-92. Even (Zalt) the 5-bladed EH-101 and EC225s have them. Not saying I wouldn't like 5 blades though.......

Personally I'd be surprised if this was the cause of the RTB. The system is very sensitive in detecting faults and displays either AVC FAIL or AVC DEGRD when there's a fault. The checklist response is to continue the flight - at reduced speed if necessary. It's also an MEL item and is not required for dispatch.
212man is offline  
Old 22nd Dec 2010, 02:29
  #1960 (permalink)  
 
Join Date: Dec 2000
Location: Arlington, Tx. US
Posts: 618
Horror,

AVC are generally required for high speed cruise to reduce vibration levels. They are generally poor for tranistory activities due to lag times. On takeoff there should be little vibratory forces coming down from the rotor between takeoff and climb out that would require an AVC. Also AVC's only handle one frequency (n/rev where n is the number of blades). These kind of aborts are generally 1/rev where something let go in the main or tail rotor.

Now if the AVC went ape-s**t which they can do would be an issue, but I do not see why that would happen as going to forward speed. It should show up in hover.

The Sultan

Last edited by The Sultan; 22nd Dec 2010 at 04:13.
The Sultan is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.