diff --git a/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.cpp b/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.cpp
index f5ebe38c..a38b24c0 100644
--- a/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.cpp
+++ b/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.cpp
@@ -97,3 +97,15 @@ ReturnValue_t TcPacketPus::setData(uint8_t *dataPtr, size_t maxSize, void *args)
   tcData = reinterpret_cast<TcPacketPointer *>(const_cast<uint8_t *>(dataPtr));
   return HasReturnvaluesIF::RETURN_OK;
 }
+
+void TcPacketPus::setApplicationData(const uint8_t *data, size_t len, bool updateSpLenField) {
+  if(data == nullptr) {
+    len = 0;
+  }
+  if(data != nullptr) {
+    std::memcpy(&tcData->appData, data, len);
+  }
+  if(updateSpLenField) {
+    setPacketDataLength(calculateFullPacketLength(len) - sizeof(CCSDSPrimaryHeader) - 1);
+  }
+}
diff --git a/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.h b/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.h
index 47173dad..543f1030 100644
--- a/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.h
+++ b/src/fsfw/tmtcpacket/pus/tc/TcPacketPus.h
@@ -49,6 +49,27 @@ class TcPacketPus : public TcPacketPusBase {
    */
   TcPacketPus(const uint8_t* setData);
 
+  /**
+   * Initializes the Tc Packet header.
+   * @param apid APID used.
+   * @param sequenceCount Sequence Count in the primary header.
+   * @param ack Which acknowledeges are expected from the receiver.
+   * @param service   PUS Service
+   * @param subservice PUS Subservice
+   */
+  void initializeTcPacket(uint16_t apid, uint16_t sequenceCount, uint8_t ack, uint8_t service,
+                          uint8_t subservice, pus::PusVersion pusVersion, uint16_t sourceId = 0);
+  /**
+   * Set the application data field by copying the provided data to the application data field.
+   * This function can also update the space packet length
+   * field. To only update the SP length field with empty application data, simply pass 0 as
+   * length of nullptr as data.
+   * @param data
+   * @param len
+   * @param updateSpLenField
+   */
+  void setApplicationData(const uint8_t* data, size_t len,  bool updateSpLenField);
+
   // Base class overrides
   uint8_t getSecondaryHeaderFlag() const override;
   uint8_t getPusVersionNumber() const override;
@@ -65,17 +86,6 @@ class TcPacketPus : public TcPacketPusBase {
  protected:
   ReturnValue_t setData(uint8_t* dataPtr, size_t maxSize, void* args = nullptr) override;
 
-  /**
-   * Initializes the Tc Packet header.
-   * @param apid APID used.
-   * @param sequenceCount Sequence Count in the primary header.
-   * @param ack Which acknowledeges are expected from the receiver.
-   * @param service   PUS Service
-   * @param subservice PUS Subservice
-   */
-  void initializeTcPacket(uint16_t apid, uint16_t sequenceCount, uint8_t ack, uint8_t service,
-                          uint8_t subservice, pus::PusVersion pusVersion, uint16_t sourceId = 0);
-
   /**
    * A pointer to a structure which defines the data structure of
    * the packet's data.