Citation X captain reported loss of all nav capability except standby compass shortly after takeoff....

Narrative:

We had a dual IRS failure immediately after takeoff. The nav database was updated that morning. We got no indications in the cockpit until the dual failure. The system logged 3 pages of faults and codes; starting when we left [departure airport]; but we got no EICAS messages in the cockpit. We navigated visually to [destination]. Navigation was reduced to only the standby magnetic compass and dead reckoning on the short flight. All navigation ability was lost. I have many reasons to suspect that maintenance loaded the wrong database that morning. A different database was loaded at [destination] and their narrative was that no failures were noted; even after simulated flight parameters were entered. Luckily we were VMC on the short flight and we were able to complete the flight without further incident. No emergency was declared because it was roughly a 20 mile flight; and VMC prevailed.I would like to know why a citation X lost all navigational ability in flight. Obviously this was a very serious issue and could have been exponentially worse in IMC conditions. How can a dual IRS aircraft; with a split bus electrical system fail at the same time? I believe the wrong database information was entered that morning. A detailed follow up is needed for this potentially serious condition.

Original NASA ASRS Text

Title: Citation X Captain reported loss of all nav capability except standby compass shortly after takeoff. Captain suspects anomaly was related to improper nav database software load.

Narrative: We had a dual IRS failure immediately after takeoff. The nav database was updated that morning. We got no indications in the cockpit until the dual failure. The system logged 3 pages of faults and codes; starting when we left [departure airport]; but we got no EICAS messages in the cockpit. We navigated visually to [destination]. Navigation was reduced to only the standby magnetic compass and dead reckoning on the short flight. All navigation ability was lost. I have many reasons to suspect that Maintenance loaded the wrong database that morning. A different database was loaded at [destination] and their narrative was that no failures were noted; even after simulated flight parameters were entered. Luckily we were VMC on the short flight and we were able to complete the flight without further incident. No emergency was declared because it was roughly a 20 mile flight; and VMC prevailed.I would like to know why a Citation X lost all navigational ability in flight. Obviously this was a very serious issue and could have been exponentially worse in IMC conditions. How can a dual IRS aircraft; with a split bus electrical system fail at the same time? I believe the wrong database information was entered that morning. A detailed follow up is needed for this potentially serious condition.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1486452
Time
Date	201710
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Navigational Equipment and Processing
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Citation X captain reported loss of all nav capability except standby compass shortly after takeoff. Captain suspects anomaly was related to improper nav database software load.