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Robinson R44

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Robinson R44

Old 6th Dec 2015, 18:10
  #1481 (permalink)  
 
Join Date: Jun 2006
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Cran now I feel much safer
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Old 6th Dec 2015, 18:37
  #1482 (permalink)  
 
Join Date: Nov 2004
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for additional design ideas for RHC, here is a (sadly) long forgotten thread that is full of brainwaves!

http://www.pprune.org/rotorheads/209...inson-r88.html
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Old 22nd May 2016, 10:48
  #1483 (permalink)  
 
Join Date: Dec 2014
Location: Africa
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Question Landing light globe failures

I know that Robinson now offers LED-type landing lights. This question is about the traditional incandescent landing light globes (which in the case of a Raven II would be two 28V, 100W, General Electric GE4591 bulbs).

We feel that these globes fail too often. In all cases, the filament is 'gone', sometimes with, or sometimes without, black charring inside the glass. But never is the glass of the bulb imploded or cracked, nor does the circuit breaker ever trip.

I tried to search this Forum for advise but couldn't find any thread that has dealt with this matter. Hence my question: What is in your experience the typical failure rate of these globes in a R44? And has anybody identified specific operating conditions that cause those globes blow more often?

Fix wing people indeed report (in this Forum and elsewhere) frequently the same problem. Admittedly, a broken landing light seems to be a much bigger problem for a fix winger, during any night landing. Whereby arguably in a helicopter, landing lights are not needed for safe night operations, provided you operate to and from landing sites that are equipped with "night flying facilities", which again in many legislations is a minimum requirement for any night ops (however, in case of night autos a working landing light would be a great benefit ).

We only started keeping accurate records of this 'routine' replacements recently. Over the past 300 flying hours (engine Hobbs) we had 11 blown bulbs, with any one globe failing between 20 and 120 HRS after its last replacement. This is flying time, and the actual time with lights ON would me much less, although the lights get switched ON once during daily preflight (with engine OFF) and occasionally during flight.

The average life of a given globe therefore is around 60 flying hours. Practically that means (as the a/c has two landing light globes) that in average every 30 HRS either one globe has to be changed. (Only once though we had that both globes were blown at the same time.)

Is that still normal?
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Old 22nd May 2016, 12:04
  #1484 (permalink)  
 
Join Date: Apr 2012
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I was flying scenics out in central Australia and if left on they would blow after a few landings.

Engineer recommended turning them off on approach as they overheat in hot climates at low speeds.

The LED ones are loads better they should be standard fitment IMO.
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Old 23rd May 2016, 09:50
  #1485 (permalink)  
 
Join Date: Jun 2008
Location: England & Scotland
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Turn off the landing lights before setting the machine down. When hot, it seems that the filament is less able to withstand any shock from setting down with anything other than a feather-bed kiss of the ground.


Not limited to R44; OP notes fixed-wing comment and I fly EC120. I think the LED option is to be preferred.
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Old 23rd May 2016, 10:28
  #1486 (permalink)  
 
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I think the LED option is to be preferred

...or get more practice at landing gently
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Old 23rd May 2016, 20:22
  #1487 (permalink)  
 
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Not possible with a machine used for initial training (R44) or one where you are not the only pilot (EC120 Charter work)
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Old 24th May 2016, 20:54
  #1488 (permalink)  
 
Join Date: Nov 2007
Location: Where it rains a lot .....
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Hi john,
Is the led light not available for the 120 ?
Although 24 for the front light isn't the end of the world when u need one anyways....
Did you know the same light was fitted to the 1970,s masey furgesen tractor ........

Nelly
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Old 24th May 2016, 21:01
  #1489 (permalink)  
 
Join Date: May 2007
Location: Warwick
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Nelly - totally off subject; but do you know which model Massey had the same bulb?

(My father in law is a tractor buff and is convinced helicopters are the work of the devil... be nice to show him a link!).

C.
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Old 25th May 2016, 18:55
  #1490 (permalink)  
 
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...one where you are not the only pilot (EC120 Charter work)

John - surely a student would only need the landing lights on for landing once he/she had the experience to land gently?! And I don't see why different pilots in a 120 should make a difference


Re HID/LED landing for a 120; I'd be interested in one of those too!
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Old 26th May 2016, 13:05
  #1491 (permalink)  
 
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May not be possible with the R44, however, in light airplanes, if the landing light is installed (rotated) so that the filament is vertical instead of horizontal, the life of the bulb is significantly extended.
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Old 26th May 2016, 19:13
  #1492 (permalink)  
 
Join Date: Dec 2014
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Thanks EN48, will give this a try.
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Old 29th May 2016, 14:26
  #1493 (permalink)  
 
Join Date: Dec 2014
Location: Africa
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As you already said, this is not possible in the R44. The bulb has a nudge, and there is a matching gap in the fuselage. So there is only one orientation (which is exactly horizontal) the bulb can be installed.
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Old 6th Jun 2016, 08:23
  #1494 (permalink)  
 
Join Date: Dec 2014
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Originally Posted by Aluminium Mallard View Post
I was flying scenics out in central Australia and if left on they would blow after a few landings.

Engineer recommended turning them off on approach as they overheat in hot climates at low speeds.

The LED ones are loads better they should be standard fitment IMO.
Actually, Robinson doesn't offer LED landing lights. Even the latest R44's come out with High Intensity Discharge (HID) lamps. LED is not an option, at least not on the RHC price list.

The conversion from incandescent to HID is possible, but it is not a 1-on-1 replacement, as an electronic ballast has to be installed.

Any experience how long those HID lasts in the field?
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Old 7th Jun 2016, 22:45
  #1495 (permalink)  
 
Join Date: Apr 2008
Location: Louisiana, USA
Age: 50
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Try a Q4591 bulb. same bulb same size but is quartz halogen and has a flashlight type bulb inside the main glass...no flimsy filament to keep breaking. They are a lot more expensive (123.00 US Dollars) but they last for ever.

Edit: Its mfg by Whelen not G.E.
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