F-35A con cargas externas en Al Dhafra Air Base, Emiratos Árabes Unidos.
https://www.afcent.af.mil/News/Article/ ... l-loadout/

As justification for the decision, Winter noted that the issue was documented while the jet was flying at the very edge of its flight envelope. He also said the phenomenon only occurred once for both the B and C models, despite numerous attempts to replicate the conditions that caused the problem.
Por otro lado, dice algo así como, que el modelo C solo puede hacer supersonico Mach 1.3 por solo 50 segundos de vueloA extremas altas altitudes, la versiones del F35 para la Armada y el Cuerpo de Marines, solo puede volar a velocidad supersonica en cortas rachas de tiempo, antes de que haya un riesgo de daño structural y pérdida de capacidades furtivas, un problema que puede hacer imposible para los F35C lograr interceptaciones supersonicas.
El Departamente de Defensa, no intentara un parche de campo para el problema, que no solo influye en el fuselaje y la pintura furtiva, si no también en la miriada de antenas en la parte de atrás del avión que son vulnerables a este daño, de acuerdo a un documento obtenido en exclusividad para Defense News.
El Programa Conjunto del F35 ha clasificado estos problemas para los modelos B y C, Categoria 1 pero por separado, un documento indica que el problema representa una desafío en el perfil de vuelo del avión. En la escala, Categoria 1 representa el más serio nivel de deficiencia.
Ambas deficiencias fueron observadas a fines del 2011 analizando test de aleteo donde ámbos el B y el C volaron a velocidades de Mach 1.3 y 1.4. Durante una inspección postvuelo en Noviembre 2011, se descubrió que el F35B sustancial "ampollamiento y abrazamiento" de la pintura furtiva en ambos lados derecho y izquierdo de la deriva de cola y el timón.
Durante test similares del F35C en Diciembre 2011, apareció "daño térmico" que comprometió la integridad estructural de la deriva y el timón de cola.
No, la limitación vienen por el uso continuado de la postcombustión para esas velocidades, mayor aceleración y mayor calentamiento por fricción.tacuster escribió:Para el modelo B son 80 segundos a Mach 1.2 , pero puede bajar a subsonico por unos segundos y volver a supersonico, en racha.
Lo que pasó es que UNA VEZ el recubrimiento de un B y C al realizar esas pruebas mostró burbujas y ampollas en determinadas zonas, cuando volvieron a intentar reproducir el problema no volvió a pasar.F-35C can only fly at Mach 1.3 in afterburner for 50 cumulative seconds
Hola, han sido dos aparatos, un B y un C.spooky escribió:Solo ha pasado con un aparato es bastante exagerado.
- Actualmente el sistema de logística del F-35 no tiene manera de evitar que los datos secretos de los operadores extranjeros no sean enviados a Estados Unidos.
- El sistema de logística del F-35 no siempre refleja la realidad, por lo que hay ocasiones en las que se tiene que cancelar una misión.
- Hay aumentos repentinos de presión en la cabina que producen "barotrauma" (dolor en oidos y senos nasales).
- En condiciones muy frías, definidas como -34°C o menos, el F-35 informa erroneamente de que las baterías han fallado, por lo que a veces las misiones son canceladas.
- El vuelo supersónico a velocidades de +M1,2 pueden causar daños estructurales y descorchones en el recubrimiento furtivo del F-35B y F-35C.
- Después de ciertas maniobras, los pilotos de F-35B/C no siempre pueden controlar el movimiento en los 3 ejes (alabeo, guiñada y cabeceo).
- Si el neumático de un F-35A o F-35B revienta al aterrizar, puede afectar a las líneas hidráulicas y poner en riesgo al avión.
- A veces aparece una "mancha verde" en la imágen ofrecida por el casco, haciendo que sea borrosa y dificultando el aterrizaje en un portaviones.
- En las noches con poca luz estelar, la cámara de visión nocturna a veces muestra estrías verdes que dificultan que todas las variantes vean el horizonte o aterricen en los barcos.
- El modo de búsqueda en el mar del radar del F-35 sólo ilumina una pequeña porción de la superficie del mar.
- Cuando el F-35B aterriza verticalmente en días muy calurosos, es posible que los motores más antiguos no puedan producir el empuje requerido para mantener el avión en el aire, lo que provoca un aterrizaje brusco.
Código: Seleccionar todo
http://militar.org.ua/foro/enlaceno/2019/06/diversos-problemas-en-el-f-35-podrian.html
https://www.f35.com/news/detail/lockhee ... -reportingOverall Comment
The F-35s today are meeting or exceeding performance specifications and delivering unprecedented capability and safety compared to legacy fighter aircraft. The feedback we receive from F-35 pilots is exceptional – and any pilot who has flown a legacy jet consistently relays back that if they are being sent in to harm’s way – they want the F-35, every time.
These issues are important to address, and each is well understood, already resolved or on a near term path to resolution. We’ve worked collaboratively with our customers and we are fully confident in the F-35’s performance and the solutions in place to address each of the items identified.
ALIS Sovereign Data Management
ALIS meets data sovereignty requirements. Late last year, some customers requested that the F-35 enterprise develop additional capability to enable more data control.
We rolled out the additional Sovereign Data Management tool to international F-35 operators earlier this year, which allows them to manage aspects of their data that is sent to the F-35 Hybrid Production Support Integration (HPSI) team – and early feedback from the fleet is positive. It is also important to note that this has no impact to mission performance or safety of flight.
Part Inventory Data
This is a major focus at Lockheed Martin and we are implementing several actions including automation and enhanced supplier accountability processes that are delivering improved performance. Through automation, data is now vetted and validated automatically versus manually, improving speed and ensuring accurate EEL information is present before a part is delivered to the flight line.
With these new actions and related efforts, we’ve seen a 50 percent reduction in EEL and other action requests since 2017. We are confident this is on a path to resolution, which will reduce maintenance times and increase readiness rates. It is also important to note that this has no impact to mission performance or safety of flight.
Cockpit Pressurization
The cabin pressure performance today meets the specified requirement. There have been no reported cases of barotrauma in the fleet and our joint government and industry analysis shows that risk of barotrauma is minimal and that there is no imminent safety issue.The enterprise is always reviewing pilot experience improvements and we have an update that performed successfully in lab testing and will now be flight tested for future integration, based on customer timing priorities.
Cold Weather Battery Performance
This was identified during extreme cold weather testing at negative 30 degrees or below at Eielson Air Force Base, Alaska in February 2018. The probability of the issue reoccurring on aircraft in the operational fleet is very low and with minimal impact to safety of flight or operational performance.
We have developed an update to the software and the battery’s heater control system to resolve this issue – and this updated software is available for users today to load on their aircraft in the event they will be conducting extreme cold weather operations. This will also cut into production in the 2021 timeframe. We are confident this is on a path to resolution.
F-35B and F-35C Horizontal Tail Durability at Sustained Supersonic Flight
The F-35B and C deliver on all performance requirements. The potential for tailboom or horizontal tail damage during prolonged supersonic speeds was found in the highest extremes of flight testing conditions that are unlikely replicated in operational scenarios. In fact, there have been no cases of this issue occurring in the operational fleet. Additionally, this is not identified as a safety of flight concern.
We implemented a change to the coatings on the horizontal tails and tail boom beginning in Lot 8 that increases durability and resolves this concern. This update allows the F-35B and C to deliver on all performance requirements with no tail boom or horizontal tail damage concerns.
F-35B and F-35C Angle of Attack (AOA)
We’ve implemented an update to the flight control system that is planned for integration in the third quarter of this year – and we expect this item to be resolved or downgraded.
Hydraulic Lines Ruptures Caused by Blown Tires
The F-35 has two redundant hydraulic lines and there has never been a case of both lines being impacted, which ensures safe operations. Brake control software updates and pilot training have alleviated this concern and resulted in a significant drop in blown tire events. Additionally, we made minor adjustments to the location placement of hydraulic lines on the F-35C that has resolved the potential for line breaks.
We believe the item is resolved and are standing by for additional customer feedback.
Helmet “Green Glow”
The U.S. Navy continues to fly with their current helmet, demonstrating their confidence in the system, and pilots with greater than 50 night landings operate with the current Gen II helmet at night. The improved Gen III helmet has already been designed, tested and is now being qualified for use. The first few of these new helmets have been delivered and we anticipate the upgraded helmets will resolve both the green glow and night vision conditions identified.
Additionally, as camera and OLED technology advances rapidly, we expect the F-35 helmet to continue to deliver unprecedented levels of situational awareness for pilots and only improve further over time.
Radar Sea Search
The F-35’s current radar sea search function meets the enterprises’ required specification.As we modernize the F-35, we are bringing enhanced search capabilities, which represent an increase from the original requirements, and we stand ready to integrate the upgrade in the future, based on customer priorities and direction.
Thrust limits on hot days
We are supporting the Joint Program Office and Pratt and Whitney, and they can best address questions related to the F-35’s engine, which is Government Furnished Equipment to Lockheed Martin.
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