Warnings, Cautions & Notes
Gulfstream G450 Abnormals
You may know someone who says you can dispatch with a blue CAS, in fact some training vendors will tell you that. But we know this isn't true. What about:
- AGM 1 FAIL?
- Engine ALT Control?
- Engine Maintenance LTD?
- FMS 1-2-3 Fail?
- Hydraulic Temp Sen Fail?
- Mach Trim Fail?
- NRC 2 Fail?
Warnings, Cautions & Notes
Let's trace the problem from a while back to today . . .
[G450 AFM, §01-45-50]
- [1 June 2006] Amber CAS messages are DO NOT DISPATCH messages. Blue CAS maintenance messages allow dispatch as the systems that generate these messages are fault tolerant. Dispatch with an active amber or blue message shall be with reference to the MEL.
- [5 December 2013] Amber CAS messages are considered DO NOT DISPATCH messages. Blue CAS maintenance messages may allow for dispatch as the systems that generate those messages are fault tolerant. Dispatching with an active amber or blue message shall be referenced to the MEL.
- [22 July 2016] The Crew Advisory System (CAS) messages are color-coded to provide different priority levels: red (Warning), amber (Caution), and blue (Advisory). Advisory messages are further classified into 'Status', 'Information', and 'Maintenance' messages. For airplane dispatch capability, refer to the MEL and MMEL Policy Letters PL-25, PL-34 and PL-36.
I don't think that was true back then, so we pushed for change . . .
This is a move in the right direction.
You should also look at the particular message in the QRH where you are often given pretty specific instructions regarding dispatch.
Red, Amber, and Blue
[G450 AOM, §2A-31-70 ¶1] If a CAS threshold is exceeded, the MWS prompts the display of the appropriate text message on the cockpit Display Unit (DU) configured for CAS messages. The messages are displayed in red, amber or blue text appropriate to the urgency of the malfunction and arranged chronologically with the most recent message at the top of the category.
- Red text for warnings indicating a condition that may result in injury or loss of life
- Amber text for cautions indicating a condition that result in damage to or loss of equipment
- Blue text for advisories indicating a condition degraded from normal operational specifications
References
FAA MMEL Policy Letter 25, MMEL and MEL Definitions
FAA MMEL Policy Letter 34, MMEL and MEL Preamble
FAA Policy Letter 36, FAR Part 91 MEL Approval & Preamble
Gulfstream G450 Aircraft Operating Manual, Revision 35, April 30, 2013.
Gulfstream G450 Airplane Flight Manual, Revision 24, September 18, 2009
Gulfstream G450 Airplane Flight Manual, Revision 36, December 5, 2013
Gulfstream G450 Airplane Flight Manual, Revision 41, July 22, 2016
Revision: 20161004
Always remember that Eddie, when you get right down to it, is just a pilot. He tries to give you the facts from the source materials but maybe he got it wrong, maybe he is out of date. Sure, he warns you when he is giving you his personal techniques, but you should always follow your primary guidance (Aircraft manuals, government regulations, etc.) before listening to Eddie.
Please note: Gulfstream Aerospace Corporation has no affiliation or connection whatsoever with this website, and Gulfstream does not review, endorse, or approve any of the content included on the site. As a result, Gulfstream is not responsible or liable for your use of any materials or information obtained from this site.
