Gauntlet tests in general are focused on integrated system integrity and functionality (hardware and software). The purpose of the factory gauntlet is to test most of the airplanes systems (not the engines or the APU) integrated on the airplane in a simulated flying environment. The intermediate and final gauntlet tests are more thorough and include engines and the APU. The engines will be run at various power settings during gauntlet testing. However, the pre-flight engine testing is a separate activity. We have not assigned specific time periods for these tests.
Jon Ostrower posted an article regarding the remaining series of tests and checkouts to be done before first flight of the 787. Jon cautions that it may not be a complete guide to the remaining work but it does give us an idea of the work yet to be done.
In short the remaining testing will utilize the static test frame (ZY997), Dreamliner 1 (ZA001) and Dreamliner 2 (ZA002).
Please read Jon's post here. I've summarize some of the salient points below.
Two of the required three static load tests have been completed on the static test frame. Te remaining test to be done is the wing load limit test.
Ground Vibration Test is to be performed on ZA002. This airplane will be towed to building 40-24 where this test will be undertaken. So far my estimate is that it will take place in the latter half of April assuming that Dreamliner 1 conducts factory gauntlet inside 40-24 on April 10th and is then towed out to the flightline on April 13th from building 40-24.
Gauntlet Testing - first is factory gauntlet which takes place indoors (presumably in 40-24) where the aircraft is getting power from an external cart and batteries. Most of the systems are powered and tested but not all. The APU and engines are not turned on here. The second is the intermediate gauntlet which takes place out on the flightline. Here the APU and the engines are started for the first time and some of the systems are run on internal power for the first time. The aircraft is fueled up for the first time here. Lastly the final gauntlet is where the aircraft systems are powered for eight days straight and put through simulations to test the software.
Final testing will comprise of three phases. First is the Hot Test where the engines are run up to 100%. There will also be engines runs at different power settings. Second is the slow and medium speed taxi tests. Lastly there will be the high speed taxi test followed by first flight.
I don't have dates yet but the last I heard is that factory gauntlet testing should start on April 10th followed by the move outside on April 13th. We'll see if this schedule keeps.