Dawie
Topic Author
Posts: 2
Joined: Mon Feb 05, 2018 11:26 am

SAA A330-300 Johannesburg to London

Tue Feb 06, 2018 9:23 am

Hi There,

South African Airways recently announced that they will be halving the frequency of flights between Johannesburg and London and that they will be replacing the aircraft used on this route (A330-200) with the A330-300. (https://www.thesouthafrican.com/saa-int ... don-route/)

I have found 2 aspects of this announcement difficult to grasp.

1. From what I can gather, if this plan goes ahead, this route will be the longest A330-300 route in the world. In addition, Johannesburg Airport (OR Tambo International) is 5560ft AMSL, which is a major impediment on the allowable take off weight of the aircraft. Surely for this routing, the A330-200 is a better fit for this application? Would the A330-300 need to forfeit its belly freight in order to make the journey?

2. In this announcement they have claimed that the A330-300 is a superior aircraft for this application partly due to its more modern engines. To me this appears to be a false claim as the 200’s were brought in in 2011, the 300’s were brought in only 5 years later. (http://www.airfleets.net/flottecie/Sout ... e-a330.htm) SAA appears to exclusively deploy Rolls Royce engines on their Airbus fleet. The Rolls-Royce Trent 772B/C-60 engines were certified on the A330’s in 1999, so I can’t understand how the engines on the newer aircraft could be any better.

Disclosure, I am a South African Taxpayer and therefore have a vested interest in this airline's strategic planning. Some light on the matter would be appreciated.

Interestingly enough, demand for this routing is pretty high. On any given night, British Airways is operating 1/3rd of their A380 fleet between Johannesburg and London, 2 heading North and 2 heading South. (https://flightaware.com/live/findflight ... ation=FAOR)
 
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zeke
Posts: 12149
Joined: Thu Dec 14, 2006 1:42 pm

Re: SAA A330-300 Johannesburg to London

Tue Feb 06, 2018 10:23 am

Depends on the engines they have installed, there is an option to have hot and high engine performance restored with the Trent 772B-60 and Trent 772C-60
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Dawie
Topic Author
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Joined: Mon Feb 05, 2018 11:26 am

Re: SAA A330-300 Johannesburg to London

Tue Feb 06, 2018 4:36 pm

In the case of SAA's Johannesburg to New York route flown on A340-600's, the aircraft's max take off weight is limited by the max allowable take off speed of the undercarriage. Does this not apply to the A330-300 as well?
How would one find out if the max take off weight of an aircraft at high altitude is limited by the engines or the undercarriage?
 
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zeke
Posts: 12149
Joined: Thu Dec 14, 2006 1:42 pm

Re: SAA A330-300 Johannesburg to London

Tue Feb 06, 2018 6:27 pm

Never had an issue with MTOW out of JNB with the A346, the 77W on the other had has an issue with tyre speed limits.
Human rights lawyers are "ambulance chasers of the very worst kind.'" - Sky News
 
trees
Posts: 14
Joined: Tue Dec 29, 2015 3:48 pm

Re: SAA A330-300 Johannesburg to London

Wed Feb 07, 2018 3:46 pm

Dawie wrote:
In the case of SAA's Johannesburg to New York route flown on A340-600's, the aircraft's max take off weight is limited by the max allowable take off speed of the undercarriage.


That's not actually correct, the 346's are usually MTOW (368t) most nights on the JFK run.


Dawie wrote:
Does this not apply to the A330-300 as well?
How would one find out if the max take off weight of an aircraft at high altitude is limited by the engines or the undercarriage?


More often than not it is engine out performance. the 333 could probably lift 242t out of JNB no problem. The issue comes if the aircraft were to have an engine failure after V1 and has to climb out on one engine, that would not be possible out of JNB if the aircraft was at MTOW. This is where the A340 has the advantage with 4 engines as it has a substantially smaller loss of thrust if it were to loose and engine.

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