Jeppesen v. AsA Doc's
No-one has mentioned the BIGGEST difference between AirServices and Jeppesen.
AirServices have a safety-of-flight emphasis and publish information that they themselves design after careful research and validation of data.
Jeppesen have a commercial interest and re-publish information that they are given. They do not design their own procedures and do not guarantee the products are safe to use. They take what they're given - be it from a 3rd world country or not - reformat it in their style and then publish it.
Exhibit 1 your Honour. Remember the USAF T43A (B737-200) that hit a hill in Dubrovnik, Croatia on 03 April 1996 (with US Commerce Secretary Ron Brown on-board) in which all 35 people were killed? Remember that one? The crew hit a hill after flying a twin NDB approach with only one ADF on-board. It's an interesting investigation report to read. One of the contributory causes for the accident was an improperly designed instrument approach procedure. The Jeppesen Approach plate they were using was wrong because the information that Jeppesen had been given by the relevant State authority was wrong but they didn't (and don't) check it. If I remember correctly, the published MDA was 2150FT whilst the highest terrain was around 2300FT. The NTSB participated in the investigation and claimed that if the approach had been designed with standard vertical obstacle clearance limits, the aircraft would not have hit the ground.
I've used Jeppesen stuff but with the knowledge that they don't have the same safety-of-flight emphasis that the State Authority does. That's OK if you're flying in to a major airport which services RPT or in a nation that has a good Aeronautical Information Service (eg Australia) because the data has been checked by the operators. Not so good if you get off the beaten track or go to a country that just doesn't place the same emphasis on Aeronautical Information that Australia does (eg Indonesia, India....).
All I'm saying is USER BEWARE.